ARM: ux500: Remove redundant #gpio-cell properties from Snowball DT

This property has no place here as the populated node is not related
to a GPIO controller.
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NLee Jones <lee.jones@linaro.org>

arch/arm/boot/dts/snowball.dts

@@ -127,7 +127,6 @@
 			mmc-cap-mmc-highspeed;
 			vmmc-supply = <&ab8500_ldo_aux3_reg>;
 
-			#gpio-cells = <1>;
 			cd-gpios  = <&gpio6 26 0x4>; // 218
 			cd-inverted;