Created a kinetis PMC versioning scheme pulled in by Kinetis chip.h

     The motvations is to version the IP blocks of the Kinetis
     K series family of parts.

     This added versioning and configuration features for the
     Kinetis PMC IP block.

     It is envisioned that in the long term as a chip is added.
     The author of the new chip definitions will either find
     the exact configuration in an existing chip define and
     add the new chip to it Or add the PMC fature configuration
     #defines to the chip ifdef list in
     arch/arm/include/kinetis/kinetis_pmc.h  In either case the
     author should mark it as "Verified to Document Number:"
     taken from the reference manual.

     The version KINETIS_PMC_VERSION_UKN has been applied to
     most all the SoCs in the kinetis arch prior to this commit.

     The exceptions are the CONFIG_ARCH_CHIP_MK60FN1M0VLQ12,
     CONFIG_ARCH_CHIP_MK20DXxxxVLH7 All K64 and K66 have ben
     Verified PMC configurations.