use of avx2 & avx512 at CN Processing level

cmake_targets/CMakeLists.txt

openair1/PHY/CODING/nrLDPC_decoder/nrLDPC_decoder.c

...ODING/nrLDPC_decoder/nrLDPC_tools/generator_avx2/Makefile

...DPC_decoder/nrLDPC_tools/generator_avx2/cnProc_gen_avx2.c

...DPC_decoder/nrLDPC_tools/generator_avx2/cnProc_gen_avx2.h

.../CODING/nrLDPC_decoder/nrLDPC_tools/generator_avx2/main.c

...ING/nrLDPC_decoder/nrLDPC_tools/generator_avx512/Makefile

...decoder/nrLDPC_tools/generator_avx512/cnProc_gen_avx512.c

...decoder/nrLDPC_tools/generator_avx512/cnProc_gen_avx512.h

...ODING/nrLDPC_decoder/nrLDPC_tools/generator_avx512/main.c

...r/nrLDPC_tools/ldpc_gen_files/nrLDPC_cnProc_BG1_Z384_13.h

openair1/PHY/CODING/nrLDPC_decoder/nrLDPC_tools/main.c