arch: kinetis: Add support for k2x

This adds support for Kinestis K22

Co-authored-by: Sean Nyekjaer <sean.nyekjaer@prevas.dk>
Co-authored-by: Oliver Stäbler <oliver.staebler@bytesatwork.ch>
Co-authored-by: Tom Burdick <thomas.burdick@gmail.com>
Signed-off-by: Tom Burdick <thomas.burdick@gmail.com>