Resolve "Merge ulschsim containing PUSCH encoding and decoding"

See merge request oai/openairinterface5g!532

Merge remote-tracking branch 'origin/develop-nr' into 409-merge-ulschsim-containing-pusch-encoding-and-decoding

Multiple ssb detection

See merge request oai/openairinterface5g!530

Merge remote-tracking branch 'origin/develop-nr' into 409-merge-ulschsim-containing-pusch-encoding-and-decoding

redefining max number of UEs for memory allocation. Using the PHYSIM macro, different allocations are used for phy_simulators and real-time modem.

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Develop nr integration 2019w12

See merge request oai/openairinterface5g!543

removing unncesessary sleeps and mallocs, improving error messages in nr-ue.c

moving adjust sync out of measurement procedures and making it dependent on successfull decoding of DCI

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

now ulschsim.c is uplink only with no downlink decoding functions or variables

Added the following structs and enums in "defs_gNB.h"
- NR_UL_gNB_HARQ_t
- NR_gNB_ULSCH_t
- NR_SCH_status_t

added the following structs in "nfapi_nr_interface.h"
- nfapi_nr_ul_config_ulsch_pdu
- nfapi_nr_ul_config_ulsch_pdu_rel15_t
- nfapi_nr_ul_srs_config_t
- nr_pusch_freq_hopping_t

added nr_ulsch.h for the ulsch decoding function declarations
- free_gNB_ulsch
- new_gNB_ulsch
- nr_ulsch_decoding

added nr_ulsch_decoding.c for the implementation of the ulsch decoding functions
- free_gNB_ulsch
- new_gNB_ulsch
- nr_ulsch_decoding