Squashed commit of the following: arch/arm/src/s32k1xx/hardware/s32k1xx_mcm.h: Add MCM register definition file. arch/arm/src/s32k1xx/hardware/s32k1xx_memorymap.h: Add memory map definition file. arch/arm/src/s32k1xx/hardware/s32k1xx_cmu.h: Add CMU register definition file. arch/arm/src/s32k1xx/hardware/s32k1xx_pcc.h: Add PCC register definition file. arch/arm/src/s32k1xx/hardware/s32k1xx_scg.h: Add SCG register definition file. arch/arm/src/s32k1xx: Add initial Make.defs files. Basic configuration logic for the S32K1 family.