fixing l2 simulator and addressing review comments

executables/nr-ue.c

openair1/PHY/NR_UE_TRANSPORT/nr_prach.c

openair1/PHY/defs_nr_UE.h

openair1/SCHED_NR_UE/fapi_nr_ue_l1.c

openair1/SCHED_NR_UE/phy_procedures_nr_ue.c

openair2/LAYER2/NR_MAC_COMMON/nr_mac_common.h

openair2/LAYER2/NR_MAC_UE/mac_defs.h

openair2/LAYER2/NR_MAC_UE/nr_ra_procedures.c

openair2/LAYER2/NR_MAC_UE/nr_ue_procedures.c

openair2/LAYER2/NR_MAC_UE/nr_ue_scheduler.c

openair2/NR_UE_PHY_INTERFACE/NR_IF_Module.c

openair2/NR_UE_PHY_INTERFACE/NR_IF_Module.h