ARM: dts: rockchip: Fix vcc5/6-supply representation on rv1108-elgin

On rv1108-elgin-r1 board the RK805 VCC5 and VCC6 supplies come from
the BUCK2 regulator at 2.2V, so fix the representation in the
device tree.

While at it, rename it from vdd_cam to vdd_buck2, which is a better
name for the regulator label.
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rv1108-elgin-r1.dts

@@ -74,8 +74,8 @@ rk805: pmic@18 {
 		vcc2-supply = <&vcc_sys>;
 		vcc3-supply = <&vcc_sys>;
 		vcc4-supply = <&vcc_sys>;
-		vcc5-supply = <&vcc_sys>;
-		vcc6-supply = <&vcc_sys>;
+		vcc5-supply = <&vdd_buck2>;
+		vcc6-supply = <&vdd_buck2>;
 
 		regulators {
 			vdd_core: DCDC_REG1 {
@@ -90,10 +90,12 @@ regulator-state-mem {
 				};
 			};
 
-			vdd_cam: DCDC_REG2 {
-				regulator-name= "vdd_cam";
-				regulator-min-microvolt = <700000>;
-				regulator-max-microvolt = <2000000>;
+			vdd_buck2: DCDC_REG2 {
+				regulator-name= "vdd_buck2";
+				regulator-min-microvolt = <2200000>;
+				regulator-max-microvolt = <2200000>;
+				regulator-always-on;
+				regulator-boot-on;
 				regulator-state-mem {
 					regulator-state-disabled;
 				};