ARM: ux500: Add a VQMMC (level-shifting) regulator DT node for Snowball

Until recently platform code took care of all MMCI level-shifting by
way of an ios_handler() call-back. Now it is the driver's responsibility
to handle. In order to so that we need to provide the VQMMC regulator
reference in Device Tree. This patch takes care of that.
Signed-off-by: NLee Jones <lee.jones@linaro.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/snowball.dts

@@ -119,6 +119,13 @@
 			};
 		};
 
+		vmmci: regulator-gpio {
+			gpios = <&gpio6 25 0x4>;
+			enable-gpio = <&gpio7 4 0x4>;
+
+			status = "okay";
+		};
+
 		// External Micro SD slot
 		sdi0_per1@80126000 {
 			arm,primecell-periphid = <0x10480180>;
@@ -126,6 +133,7 @@
 			bus-width = <4>;
 			mmc-cap-mmc-highspeed;
 			vmmc-supply = <&ab8500_ldo_aux3_reg>;
+			vqmmc-supply = <&vmmci>;
 
 			cd-gpios  = <&gpio6 26 0x4>; // 218
 			cd-inverted;