[KINETIS] Add SPI driver for K2x family

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@7185 35acf78f-673a-0410-8e92-d51de3d6d3f4
[KINETIS] Add MCHCK board files

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@7186 35acf78f-673a-0410-8e92-d51de3d6d3f4