gold init improvement at ue for dl channels

nfapi/open-nFAPI/nfapi/public_inc/fapi_nr_ue_interface.h

openair1/PHY/NR_REFSIG/nr_gold_ue.c

openair1/PHY/NR_REFSIG/refsig_defs_ue.h

openair1/PHY/NR_UE_ESTIMATION/nr_dl_channel_estimation.c

openair1/PHY/NR_UE_ESTIMATION/nr_estimation.h

openair1/PHY/NR_UE_TRANSPORT/nr_initial_sync.c

openair1/PHY/NR_UE_TRANSPORT/nr_transport_ue.h

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_UE/nr_ue_procedures.c