ARM: ux500: Specify the ux5x0 MMCI regulator's on/off GPIO as high-enable

If not specified, the GPIO control bit is inverted by default i.e.
low-enable and high-disable. This is not the case with the MMCI
regulator, hence it will turn on during a disable and off when
regulator_enable() is invoked.
Signed-off-by: NLee Jones <lee.jones@linaro.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/dbx5x0.dtsi

@@ -679,6 +679,8 @@
 			regulator-name = "mmci-reg";
 			regulator-type = "voltage";
 
+			enable-active-high;
+
 			states = <1800000 0x1
 				  2900000 0x0>;