Merge remote-tracking branch 'origin/fix_NR_DLUL_PF' into integration_2021_wk12

ci-scripts/conf_files/gnb.band66.tm1.106PRB.usrpn300.conf

ci-scripts/conf_files/gnb.band78.tm1.106PRB.usrpn300.conf

...cripts/conf_files/gnb.band78.tm1.fr1.106PRB.usrpb210.conf

doc/SW_archi.md

executables/nr-softmodem-common.h

executables/nr-softmodem.c

executables/nr-softmodem.h

openair1/SCHED_NR/phy_procedures_nr_gNB.c

openair1/SIMULATION/NR_PHY/dlsim.c

openair1/SIMULATION/NR_PHY/pbchsim.c

openair2/LAYER2/NR_MAC_COMMON/nr_mac.h

openair2/LAYER2/NR_MAC_UE/mac_defs.h

openair2/LAYER2/NR_MAC_UE/nr_ue_dci_configuration.c

openair2/LAYER2/NR_MAC_UE/nr_ue_procedures.c

openair2/LAYER2/NR_MAC_UE/nr_ue_scheduler.c

openair2/LAYER2/NR_MAC_gNB/config.c

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler.c

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_RA.c

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_bch.c

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_dlsch.c