Merge branch 'feature-52-rrh-gw' of https://gitlab.eurecom.fr/oai/openairinterface5g into feature-52-rrh-gw

 1)remove option 'M' 2) tx shift value is set in device libraries  3) check for tx processing launching updated wrt alcatel suggestions

make changes to use the fronthaul configuration parameters - updates to rrh_gw.c and eNB_transport.c wrt to changes in openair0_device struct

update CMakelists.txt - update build_oai (add checks for args validity , minor update to linked libraries)