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

Also print the uncoded error bits

adding ldpc decoder code rate adaptation

See merge request oai/openairinterface5g!529

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

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

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

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

Resolve "Use of uninitialized variables in dlschsim"

See merge request oai/openairinterface5g!520

Resolve "memory leak in polar_init"

See merge request oai/openairinterface5g!518

Nr pdcch updates

See merge request oai/openairinterface5g!516

Critical bugs from compilation, Ocp nrsimulator

See merge request oai/openairinterface5g!512

commenting out call to dl_indication(&ue->dl_indication); as this is not finished and makes UE crash.

reverting changes to lte_phy_scope.c + commenting out call to phy_scope_eNB in nr-softmodem. The function phy_scope_gNB does not exist yet.

Nr pdcch updates

See merge request oai/openairinterface5g!514

  -- should prevent VM-creation crashes during test stages
Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>
(cherry picked from commit eeffdfa2)
Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

issue401-nr-pucch-dmrs-format_2

See merge request oai/openairinterface5g!510

Conflicts:
	openair1/PHY/MODULATION/slot_fep_nr.c
	openair1/PHY/NR_UE_ESTIMATION/nr_dl_channel_estimation.c
	targets/RT/USER/nr-ue.c

This partially reverts commit 449da9ac.