- Add the O-RAN 7.2 FHI library, interfacing with OSC xRAN library (E
  release)
- Add Findxran.cmake to detect the library and headers, including
  version information
- Test for numa and DPDK presence
- Add patch for OSC xRAN to make interworking possible
- Add sample config files for LiteOn, Benetel, and VVDN units.

Documentation is provided in the next commit.
Co-authored-by: Raymond Knopp <raymond.knopp@eurecom.fr>
Co-authored-by: Cedric Roux <cedric.roux@eurecom.fr>
Co-authored-by: Manish Kumar Singh <manish1.kumar@amd.com>
Co-authored-by: thamizhselvan.k <thamizhselvan.k@vvdntech.in>
Co-authored-by: rajeshwari.p <rajeshwari.p@vvdntech.in>
Co-authored-by: Hongzhi Wang <hongzhi.wang@openairinterface.org>
Co-authored-by: Sofia Pison <Sofia.Pison@eurecom.fr>

Certain FH 7.2 use cases require 8 antennas, so make room to propagate
this down.

For the initialization of the xran library (split 7.2), we need some
parameters such as PRACH or frame config. However, to date,
initialization of split at level 7 use the split 8 openair0_config
structure, which does not have the necessary information.

Hence, add a single structure that contains that information.

* make a single call to various function
* make fill_rf_config() static, it is only used in this file
* do not initialize the number of antennas in openair0_cfg in
  init_NR_RU(), as it is already done in fill_rf_config()

Harmonize the call to openair0_transport_load(), by putting it in a
single place instead of multiple calls

Further, delay the call to ru_thread, for two reasons:

1) it is somewhat "symmetric" with local RF, which is done there as well

2) for the xran library, we need to read some parameters such as PRACH,
   frame format, etc. At the RU, the corresponding FAPI config request
   parameter structure is copied from the gNB to RU at the beginning of
   the ru_thread, so we have to wait for that to happen.

In order to speed up processing if precoding is disabled, we just copy
the pointer from txdataF to txdataF_BF, as opposed to do a full memcpy()
to duplicate the data. The same happens if we cannot have precoding,
i.e., in SISO.

Handle the case of precoding in allocation of the txdataF_BF structure
accordingly.

For 7.2 FH, some RUs do phase compensation, whereas for others, the DU
does it. In fact, this can be "negotiated" using the M plane. Since we
don't have the M plane yet, add a configuration option to set where
precoding is performed.

For certain processing, e.g., in the case of FH 7.2, we need to ensure
that critical L1 processing happens fast. Try to force speedy processing
with this high priority.

init_RU_proc() does not start the ru_thread, this is done by
start_RU_proc()

Integration: 2024.w02

See merge request oai/openairinterface5g!2514

* !2506 NR UE MAC config fixes
* !2478 Moving computation of base graph for LDPC at MAC in the UE
* !2481 fix UE RX/TX thread several bugs in synchronisation of events, add LOG_E and...
* !2494 Fix for building rach occasions in case of multiple BWPs
* !2498 Fix security header type for PDU session establishment, and update sqn, counters
* !2509 Fixed typos in init_ru
* !2512 Null pointer in nr generate msg3 retransmission
* !2505 USRP doc: Include b205-mini, improve markup

Merge remote-tracking branch 'origin/null-pointer-in-nr_generate_Msg3_retransmission' into integration_2024_w02

Merge remote-tracking branch 'origin/fix_building_rach_occasions_for_multiple_bwps' into integration_2024_w02

fix tx_resume_ind_fifo messages sending bugs, rename associated function send_slot_ind() to what it actually does send_dl_done_to_tx_thread()

merge two reduntant and incoherent enums for rnti_type_t, make a macro to stringify properly instead of hardcoded side strings array

While testing the OAI 5G RAN in SA mode, it appears that the PDU session
establishment request is using the wrong security header type.

The current used header is: "Integrity protected and ciphered with new
5G NAS security context".

However, according to TS 24.501, Table 9.3.1, this header can only be used
by the "Security mode complete" procedure.

Changes:

 - Hence, the new security header has been changed to "Integrity protected
   and ciphered", which will use the security context generated during the
   "Security mode complete".

 - Sequences numbers and NAS counters have been updated to reflect that
   change.

Integration: 2024.w01

See merge request oai/openairinterface5g!2502

* !2482 Trigger UL Failure if Ack of Msg4 not received and implement RA Contention Resolution timer in gNB
* !2484 function to harmonize handling of NAS registraction accept
* !2487 Rework PUCCH codec with c16_t type and functions to make readable code
* !2491 improvements for NR UE detaching
* !2499 Update L1sim and RFsim documentation
* !2500 Fix FAPI CoreSetType enumeration options after the fix on the description made by SCF
* !2489 NR UE improvements RRCSetup