[SX1278] Moved driver to radio folder

cmake/boardcore.cmake

src/shared/radio/SX1278/SX1278.cpp

src/shared/radio/SX1278/SX1278.h

src/shared/radio/SX1278/SX1278Defs.h

src/tests/drivers/sx1278/test-sx1278-bench.cpp

src/tests/drivers/sx1278/test-sx1278-bidir.cpp

src/tests/drivers/sx1278/test-sx1278-core.h

src/tests/drivers/sx1278/test-sx1278-mavlink.cpp

src/tests/drivers/sx1278/test-sx1278-serial.cpp