boards: Separate boards from debug adapter configuration

boards/airfy-beacon/Makefile.include

boards/airfy-beacon/dist/openocd.cfg

boards/arduino-zero/dist/openocd.cfg

boards/b-l072z-lrwan1/Makefile.include

boards/b-l072z-lrwan1/dist/openocd.cfg

boards/bluepill/Makefile.include

boards/bluepill/dist/openocd.cfg

boards/frdm-common/Makefile.include

boards/frdm-common/dist/old-openocd-jlink-kx.cfg

boards/frdm-common/dist/old-openocd-kx.cfg

boards/frdm-common/dist/openocd-jlink-kx.cfg

boards/frdm-common/dist/openocd-kx.cfg

boards/limifrog-v1/Makefile.include

boards/limifrog-v1/dist/openocd.cfg

boards/maple-mini/Makefile.include

boards/maple-mini/dist/openocd.cfg

boards/msbiot/Makefile.include

boards/msbiot/dist/openocd.cfg

boards/mulle/Makefile.include

boards/mulle/dist/openocd.cfg