Revert transformPrecoder to transform_precoding

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

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

nfapi/open-nFAPI/nfapi/src/nfapi_p7.c

openair1/PHY/NR_ESTIMATION/nr_ul_channel_estimation.c

openair1/PHY/NR_TRANSPORT/nr_ulsch_demodulation.c

openair1/PHY/NR_UE_TRANSPORT/nr_ulsch_ue.c

openair1/SIMULATION/NR_PHY/ulsim.c

openair2/LAYER2/NR_MAC_UE/nr_ue_scheduler.c

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_RA.c

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_primitives.c

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_ulsch.c

openair2/LAYER2/NR_MAC_gNB/nr_mac_gNB.h