move function declaration in not duplicated files (.h instead of .c)

ci-scripts/conf_files/rcc.band7.tm1.nfapi.conf

ci-scripts/conf_files/ue.nfapi.conf

cmake_targets/CMakeLists.txt

executables/nr-softmodem.c

nfapi/oai_integration/nfapi_pnf.c

nfapi/oai_integration/nfapi_vnf.c

openair1/PHY/LTE_UE_TRANSPORT/dlsch_demodulation.c

openair1/SCHED/fapi_l1.h

openair1/SIMULATION/TOOLS/channel_sim.c

targets/RT/USER/lte-softmodem.c