ARM: ux500: allow Snowball access to the AB8500 GPIO pins

The AB8500 GPIO driver has been un-BROKEN and rewritten as a pinctrl
driver. Now that it's back in use, let's ensure that it's available
when booting Snowball with Device Tree enabled.

Cc: arm@kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/snowball.dts

@@ -299,6 +299,10 @@ db8500_esram34_ret_reg: db8500_esram34_ret {
 			};
 
 			ab8500@5 {
+				ab8500-gpio {
+					compatible = "stericsson,ab8500-gpio";
+				};
+
 				ab8500-regulators {
 					ab8500_ldo_aux1_reg: ab8500_ldo_aux1 {
 						regulator-name = "V-DISPLAY";