[OAI-UE] slot0 / slot1 parallelization

openair1/PHY/LTE_TRANSPORT/dci_tools.c

openair1/PHY/LTE_TRANSPORT/dlsch_demodulation.c

openair1/PHY/LTE_TRANSPORT/dlsch_llr_computation.c

openair1/PHY/LTE_TRANSPORT/proto.h

openair1/PHY/MODULATION/defs.h

openair1/PHY/MODULATION/slot_fep.c

openair1/PHY/defs.h

openair1/PHY/impl_defs_lte.h

openair1/SCHED/defs.h

openair1/SCHED/phy_procedures_lte_ue.c

targets/RT/USER/lte-ue.c