Kinetis: Symbolic names for Addresses and Commands

Change-Id: I2165b66c37bd1608139b5dd00f48124161e13ef0
Signed-off-by: Alex Austin <alex.austin@spectrumdsi.com>
Reviewed-on: http://openocd.zylin.com/1191
Tested-by: jenkins
Reviewed-by: Christopher Kilgour <techie@whiterocker.com>
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>