ARM: dts: sun6i: hummingbird: Fix VDD-CPU and VDD-GPU regulator names

The VDD-CPU and VDD-GPU regulators were incorrectly swapped.

Fixes: bab03561 ("ARM: dts: sun6i: hummingbird: Add AXP221 regulator
       nodes")
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun6i-a31-hummingbird.dts

@@ -191,18 +191,18 @@ vcc_3v0: dcdc1 {
 				regulator-name = "vcc-3v0";
 			};
 
-			vdd_cpu: dcdc2 {
+			vdd_gpu: dcdc2 {
 				regulator-always-on;
 				regulator-min-microvolt = <700000>;
 				regulator-max-microvolt = <1320000>;
-				regulator-name = "vdd-cpu";
+				regulator-name = "vdd-gpu";
 			};
 
-			vdd_gpu: dcdc3 {
+			vdd_cpu: dcdc3 {
 				regulator-always-on;
 				regulator-min-microvolt = <700000>;
 				regulator-max-microvolt = <1320000>;
-				regulator-name = "vdd-gpu";
+				regulator-name = "vdd-cpu";
 			};
 
 			vdd_sys_dll: dcdc4 {