Develop nr adding 2018 09 asn1 only

See merge request oai/openairinterface5g!420

1. Fix the problem of compiling NR_RangeToBestCell.c of NR-RRC 15.3.0
2. Fix the problem that default OCTET/BIT STRING value not used in APER
3. Add support of extension group inside CHOICE type used in LTE-RRC 15.3.0
4. Fix the problem that NGAP 15.0.0 ASN.1 can not generate C files

Polar decoder optimizations

See merge request oai/openairinterface5g!413

Conflicts:
	cmake_targets/CMakeLists.txt
	openair1/PHY/CODING/TESTBENCH/polartest.c
	openair1/PHY/CODING/nrPolar_init.c
	openair1/PHY/CODING/nrPolar_tools/nr_polar_decoder.c
	openair1/PHY/CODING/nrPolar_tools/nr_polar_decoding_tools.c
	openair1/PHY/CODING/nrPolar_tools/nr_polar_defs.h
	openair1/PHY/CODING/nrPolar_tools/nr_polar_rate_match.c
	openair1/PHY/NR_TRANSPORT/nr_pbch.c

NR PRACH development integration

Merge branch 'polar-decoder-optimizations' of https://gitlab.eurecom.fr/oai/openairinterface4g into polar-decoder-optimizations

Conflicts:
	openair1/PHY/CODING/nrPolar_tools/nr_polar_defs.h