initial split of UE/eNB directories

openair1/PHY/LTE_TRANSPORT/dci.c

openair1/PHY/LTE_TRANSPORT/pbch.c

openair1/PHY/LTE_UE_TRANSPORT/dci_tools_ue.c

openair1/PHY/LTE_UE_TRANSPORT/dlsch_decoding.c

openair1/PHY/LTE_UE_TRANSPORT/dlsch_demodulation.c

openair1/PHY/LTE_UE_TRANSPORT/dlsch_llr_computation.c

openair1/PHY/LTE_UE_TRANSPORT/dlsch_llr_computation_avx2.c

openair1/PHY/LTE_UE_TRANSPORT/drs_modulation.c

openair1/PHY/LTE_UE_TRANSPORT/ulsch_coding.c

openair1/PHY/LTE_UE_TRANSPORT/ulsch_modulation.c