Split phy_init.h into two files (for LTE/NR)

executables/nr-gnb.c

executables/nr-ru.c

executables/nr-softmodem.c

executables/nr-ue.c

executables/nr-uesoftmodem.c

nfapi/oai_integration/nfapi_pnf.c

openair1/PHY/INIT/nr_init.c

openair1/PHY/INIT/nr_init_ue.c

openair1/PHY/INIT/nr_parms.c

openair1/PHY/INIT/nr_phy_init.h

openair1/PHY/INIT/phy_init.h

openair1/PHY/NR_TRANSPORT/srs_rx.c

openair1/PHY/NR_UE_ESTIMATION/nr_ue_measurements.c

openair1/PHY/NR_UE_TRANSPORT/nr_pbch.c

openair1/SCHED_NR/phy_procedures_nr_gNB.c

openair1/SCHED_NR_UE/phy_procedures_nr_ue.c

openair1/SIMULATION/NR_PHY/dlschsim.c

openair1/SIMULATION/NR_PHY/dlsim.c

openair1/SIMULATION/NR_PHY/pbchsim.c

openair1/SIMULATION/NR_PHY/prachsim.c