ARM: ux500: Use the correct name when supplying a GPIO enable pin

Correct a typo in the Device Tree source file, where instead of
specifying property 'enable-gpio', which the driver is expecting
we specified 'gpio-enable' instead.
Signed-off-by: NLee Jones <lee.jones@linaro.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/hrefprev60.dts

@@ -40,7 +40,7 @@
 
 		vmmci: regulator-gpio {
 			gpios = <&tc3589x_gpio 18 0x4>;
-			gpio-enable = <&tc3589x_gpio 17 0x4>;
+			enable-gpio = <&tc3589x_gpio 17 0x4>;
 
 			status = "okay";
 		};