- nr_ulsim supports multiple DMRS configurations

- added get_l_prime function
- added Table 6.4.1.1.3-3
- added added is_dmrs_symbol function

Integration develop nr 2019w50

See merge request oai/openairinterface5g!735

Merge remote-tracking branch 'origin/ru-parallel-beamforming-merge' into integration-develop-nr-2019w50

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

Initial implementation.

nr_rlc/nr_rlc_oai_api.c will need some clean rewrite at some point.

More testing is also needed.

bug fix: ue was not reading options + more debug printf cleanup in openair1/PHY/NR_UE_TRANSPORT/dci_nr.c

Fix usrp_lib for threequarter sampling

See merge request oai/openairinterface5g!732

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

An avx2 instruction in idft4096 introduced segfault sometimes

Integration develop nr 2019w48bis

See merge request oai/openairinterface5g!729

Merge branch 'ru-parallel-beamforming-merge' of https://gitlab.eurecom.fr/oai/openairinterface5g into ru-parallel-beamforming-merge