ARM i.MX53: mba53: add missing gpio stuff for pca9554

Add properties to make use of pca9554 gpio expander.

Signed-off-by: Markus Niebel <Markus.Niebel@tqs.de>
Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
1 file changed