Allow gNB to read pusch_AntennPorts from config file

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

openair1/SIMULATION/NR_PHY/dlsim.c

openair1/SIMULATION/NR_PHY/ulsim.c

openair2/COMMON/rrc_messages_types.h

openair2/GNB_APP/gnb_config.c

openair2/GNB_APP/gnb_paramdef.h

openair2/LAYER2/NR_MAC_gNB/config.c

openair2/LAYER2/NR_MAC_gNB/mac_proto.h

openair2/RRC/NR/nr_rrc_defs.h

openair2/RRC/NR/rrc_gNB.c

openair2/RRC/NR/rrc_gNB_nsa.c

.../GENERIC-LTE-EPC/CONF/gnb.band78.tm1.106PRB.usrpn300.conf