ARM i.MX53: mba53: Add display support

As the displays are optional and we have more than one, also
set the status of the parallel display and the ldb to disabled.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>