implementing:
- generate_ue_ulsch_params (customized for ulsim only)
- nr_ue_ulsch_procedures
- nr_ue_pusch_common_procedures

- Added "nr_ulsch.c" file in NR_TRANSPORT
- Renamed "nr_ulsch.c" in NR_UE_TRANSPORT to "nr_ulsch_ue.c"
- Added "nr_ulsch_unscrambling" declaration to "nr_ulsch.h"
- Added "nr_ulsch_unscrambling" definition to "nr_ulsch.c"
- Added new test in "ulsim.c" to test encoding/decoding + scrambling/unscrambling

to ulsim.c and removed them from ulschsim.c

Also changed the linked libraries for the "ulsim.c" as it was causing linker problems

Develop nr fixes 2019w23

See merge request oai/openairinterface5g!601

Integration nr 2019 w21

See merge request oai/openairinterface5g!598