rename sdr to radio

CMakeLists.txt

common/utils/DOC/loader/devusage.md

doc/BUILD.md

doc/RUNMODEM.md

executables/main_ru.c

executables/nr-gnb.c

executables/nr-ru.c

executables/nr-softmodem-common.h

executables/nr-softmodem.c

executables/nr-uesoftmodem.c

openair1/PHY/LTE_TRANSPORT/if4_tools.c

openair1/PHY/TOOLS/Makefile

openair1/PHY/TOOLS/calibration_test.c

openair1/PHY/defs_L1_NB_IoT.h

openair1/PHY/defs_nr_UE.h

openair1/PHY/thread_NR_UE.h

openair1/SIMULATION/LTE_PHY/syncsim.c

openair1/SIMULATION/TOOLS/DOC/rtusage.md

openair2/ENB_APP/NB_IoT_config.c

openair2/ENB_APP/enb_config.c