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

 - command line paramter --clock-source can only be set at UE (removed this option from gNB)
 - at gNB use clock_source from RU section in config file
 - in both cases if clock_source is present in usrp_args, it will override clock_source

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

Signed-off-by: Prateek Bidwalkar <prateek.bidwalkar@ipaccess.com>

Signed-off-by: Prateek Bidwalkar <prateek.bidwalkar@ipaccess.com>