Merge pull request #6292 from bergzand/jc42

drivers/Makefile.dep

drivers/Makefile.include

drivers/include/jc42.h

drivers/jc42/Makefile

drivers/jc42/include/jc42_internal.h

drivers/jc42/include/jc42_params.h

drivers/jc42/jc42.c

drivers/jc42/jc42_saul.c

sys/auto_init/auto_init.c

sys/auto_init/saul/auto_init_jc42.c

tests/driver_jc42/Makefile

tests/driver_jc42/README.md

tests/driver_jc42/main.c