MR936: nr_fdd_if_fix
- Add support for 5G NR FDD bands and introduce configurable IF frequencies (esp. on nrUE) with configurable UL-DL-frequency offset. 
 
MR940: dongzhanyi-zte-develop2  
- Solved the problem that UE UL LDPC code can only process data within 8 code blocks (the UE UL LDPC code could only process data within 8 code blocks. If there were more than 8 code blocks, an error would occur)

MR943: NR_UE_MAC_scheduler
- Dynamic calculation of slot for PUSCH transmission based on slot offset k2. PUSCH slot is no longer hard-coded to 8.
- Support for multiple UL allocations in a frame by supporting a ul_config_request per UL slot.
- Support for multiple PDUs per slot
- Fixes for a few UE crashes/assertion failures due to invalid DCI received
- UE scheduler code clean-up

- In gNB_scheduler int is updated to long int to avoid warnings for
printf

- Direct multiply with the conjugate of the estimation for compensation

 - in PTRS processing the default value for DMRS is set outside slot
   processing.

- Removed tx_gain calculations and multiplication with tx signal
- Updated sigma value calculations and removed unused variables
- Re-indent the related code for better readability

Integration 2020 wk45 (2) comprising:

MR937:Nr dl sched fixes  
-restore old phytest scheduler behavior
-correct TA scheduling
-correct SSB
-shorten interface of `nr_fill_nfapi_dl_pdu()`
-Track RB allocation on symbol basis (bitmap)
-add a `remove_nr_ue_list()`, could be used instead of MR !934

MR910:5G SA NAS messages 
- 5G SA nass messages and a simple unitary test code
 
MR927:Nr rrc configuration fr2
- introduces some bug fixes for FR2 that might also have an impact on FR1.

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

 Conflicts:
	openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_bch.c

- Sin cos table quadrant condition checks are updated
- function are indented properly
- Debug prints are updated for double data type

- Added PTRS Symbols in a slot and Resource elements count in debug print

- Most DL code is reused for Ul also to reduce code duplication
- Common CPE calculation function is used for error estimation
- Common slot processing function is used for inter/extrapolation
- Removed old implementation dedicated to UL

- As new sin cos table is used in phase noise function it shall be
  initialized for ULSIM also

- Initialized variable to remove the valgrind issue.

- updated return function value to -1
- removed static variable for dmrs symbol selection for channel
- Updated sin cos quadrant check conditions
- removed casting from PTRS slope and related calculations

Conflicts:
	ci-scripts/conf_files/gnb.band78.tm1.106PRB.usrpn300.conf
	openair2/LAYER2/NR_MAC_UE/config_ue.c
	openair2/LAYER2/NR_MAC_gNB/config.c

The SSB nFAPI message is only sent every 8 frames, and automatically
repeated by the PHY layer in between. This commit sets the vrb_map
structure in those frames in between nFAPI so that the scheduler does
not schedule on such resources.