Merge branch 'develop' into bugfix/gpio/64bit

Makefile.embedded

Makefile.help

Makefile.include

arch/cpu/arm/cortex-m/Makefile.cortex-m

arch/cpu/arm/cortex-m/cm3/Makefile.cm3

arch/cpu/arm/cortex-m/cm4/Makefile.cm4

arch/cpu/cc2538/cc2538-def.h

arch/cpu/cc2538/dev/cc2538-rf.c

arch/cpu/cc2538/dev/spi-arch.c

arch/cpu/cc26xx-cc13xx/Makefile.cc13xx

arch/cpu/cc26xx-cc13xx/Makefile.cc26x0r2f

arch/cpu/cc26xx-cc13xx/Makefile.cc26xx

arch/cpu/cc26xx-cc13xx/Makefile.cc26xx-cc13xx

arch/cpu/cc26xx-cc13xx/cc13xx-cc26xx-conf.h

arch/cpu/cc26xx-cc13xx/cc13xx-cc26xx-def.h

arch/cpu/cc26xx-cc13xx/cc26xx.ld

arch/cpu/cc26xx-cc13xx/dev/gpio-hal-arch.c

arch/cpu/cc26xx-cc13xx/dev/gpio-hal-arch.h

arch/cpu/cc26xx-cc13xx/dev/soc-rtc.c

arch/cpu/cc26xx-cc13xx/dev/soc-trng.c