ARM: mxs/mx28evk: add leds-gpio device for heartbeat

It adds LED2 on mx28evk board as heartbeat trigger for diagnostic
purpose.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2 files changed