issue still with nr_ulsim (Bus Error on aarch64)

optimizations for 128-bit to improve performance of LDPC encode/decode
on aarch64 (Neoverse 1)

integration_2023_w14

See merge request oai/openairinterface5g!2048

* !1861 NR UE RX Multi-threading
* !2017 scheduling aperiodic SRS at UE
* !2046 Correctly allocate GUTI in NAS UE structures
* !2033 PBCH radio link failure detection at MAC
* !1959 bugfix: change memory management of interface between PHY and MAC scheduler
* !2041 hack: see "Bye." message when quitting gnb running with aw2s
* !2047 NR RRC - RRCReestablishment - Fix MultiplePDU Regression

Merge remote-tracking branch 'origin/nr-rrcreestablishment-fix-multipdu-proper-commits' into integration_2023_w14

Changes
1. Passing function argument  by reference.
2. Use a pointer for ue->established_drbs[drb_id - 1] in generateDRB.

This commit fixes a bug caused by global variables in the gNB_MAC_INST
structure used to transfer MAC scheduler's results to the PHY layer.

When using several threads in the PHY layer, it may happen that the
MAC scheduler is called a second time by the second PHY thread for the
next slot before the content of the global variables in the gNB_MAC_INST
structure used to store the result of the MAC scheduler for the current
slot have been consumed by the first thread, leading to unpredictable
results (all of them certainly wrong).

The solution is to introduce a small memory management module for the
interface between the PHY threads and the MAC scheduler. The MAC
scheduler now fills the data structures passed to it, and not a
global variable anymore. The PHY layer manages the structures and
ensures that no data is overwritten before being fully consumed by
the various threads of the PHY layer.

Some care has to be taken because several PHY threads will access the
same structures at the same time for a given slot (in read mode, so
it's okay). A mechanism of reference counting has thus been introduced.

Only one CC is supported. This restriction should not be too hard
to remove if/when needed. (The code before this commit does not seem
to work for more than one CC anyway.)