nFAPI fix for L2 nFAPI simulator.

See merge request oai/openairinterface5g!670

Merge branch '442-integrate-pusch-into-nr-ue-softmodem' of https://gitlab.eurecom.fr/oai/openairinterface5g into 442-integrate-pusch-into-nr-ue-softmodem

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

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

Integration develop nr w37

See merge request oai/openairinterface5g!668

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

Conflicts:
	executables/nr-ru.c
	nfapi/open-nFAPI/nfapi/public_inc/nfapi_nr_interface.h

Merge remote-tracking branch 'origin/443-add-support-to-create-vcd-files-in-develop-nr' into integration_develop-nr_w37

adding MAC part of 5G FAPI interface for PUSCH. Since the previous version was incomplete anyway I merged in the new SCF specs and used those (only for PUSCH). Todo: implement PHY part.

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

- start_rb was set to 30, and nb_rb was set to 50 with NB_RB_DL = 106.
- When the DC subcarrier is included in the RB allocation,
  this causes errors in FFT/IFFT operations arounf the DC subcarrier
- This leads to errors in unscrambling and decoding