fix srb2 addition, simplify and remove dead code, fix one race

executables/cuup.c

openair1/SIMULATION/NR_PHY/dlsim.c

openair1/SIMULATION/NR_PHY/prachsim.c

openair1/SIMULATION/NR_PHY/ulsim.c

openair2/F1AP/dummy_enb.c

openair2/GNB_APP/gnb_config.c

openair2/LAYER2/NR_MAC_gNB/main.c

openair2/LAYER2/nr_pdcp/nr_pdcp_oai_api.c

openair2/RRC/NR/cucp_cuup_direct.c

openair2/RRC/NR/nr_rrc_common.c

openair2/RRC/NR/nr_rrc_extern.h

openair2/RRC/NR/nr_rrc_proto.h

openair2/RRC/NR/rrc_gNB.c