emev2: GPIOLIB: Enable support for OF

EMEV2 is now a DT platform, however the GPIO driver cannot be used
from a DT file since it does not fill out the of_node field in its
gpio_chip structure.

Signed-off-by: Ian Molton <ian.molton@codethink.co.uk>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpio-em.c b/drivers/gpio/gpio-em.c
index c6e1f08..160d759 100644
--- a/drivers/gpio/gpio-em.c
+++ b/drivers/gpio/gpio-em.c
@@ -319,6 +319,7 @@
 	}
 
 	gpio_chip = &p->gpio_chip;
+	gpio_chip->of_node = pdev->dev.of_node;
 	gpio_chip->direction_input = em_gio_direction_input;
 	gpio_chip->get = em_gio_get;
 	gpio_chip->direction_output = em_gio_direction_output;