ARM: orion5x: use gpio-keys and gpio-leds instead of gpio_keys/gpio_leds in edmini_v2

As noted by Sebastian Hesselbarth, the Device Tree nodes for GPIO keys
and LEDs should be named gpio-keys and gpio-leds.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Link: https://lkml.kernel.org/r/1398202002-28530-16-git-send-email-thomas.petazzoni@free-electrons.com


Signed-off-by: Jason Cooper <jason@lakedaemon.net>