Add basic i.MX27 CPU support
Signed-off-by: NJuergen Beisert <j.beisert@pengutronix.de>

This patch adds basic mach support for the mx2 processor family, based
on the original freescale code and adapted to mainline kernel coding
style.
Signed-off-by: NJuergen Beisert <j.beisert@pengutronix.de>