ARM: dts: meson8m2: mxiii-plus: rename the DCDC2 regulator

The DCDC2 regulator output is actually called "VDD_EE" in various
Meson8b board schematics. This matches with what Amlogic names it in the
most part of their vendor kernel (there are a few places where it's
actually called VDDAO, schematics of EC-100 suggest that the regulator
output is used for both signals).
While here, also give the regulator an alias as it supplies the Mali GPU
so a phandle to it will be required later on.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

arch/arm/boot/dts/meson8m2-mxiii-plus.dts

@@ -114,8 +114,9 @@ vcck: DCDC1 {
 				regulator-always-on;
 			};
 
-			DCDC2 {
-				regulator-name = "VDDAO";
+			vddee: DCDC2 {
+				/* the output is also used as VDDAO */
+				regulator-name = "VDD_EE";
 				regulator-min-microvolt = <950000>;
 				regulator-max-microvolt = <1150000>;
 				regulator-boot-on;