ARM: dts: enable rk808 dvs

Buck1/2 can be controlled by gpio dvs, this is GPIO specifiers
for 2 host gpio's used for dvs. The format of the gpio specifier depends in
the gpio controller. If DVS GPIOs aren't present, voltage changes will happen
very quickly with no slow ramp time.

pick from 73b1e5e

Change-Id: I969c0f6723d8dcada8c6dcebbe2bcd93210e2f39

Author: Andy3Kuo

arch/arm/boot/dts/rk3288-tinker-board.dts

@@ -365,7 +365,10 @@
 		interrupt-parent = <&gpio0>;
 		interrupts = <4 IRQ_TYPE_LEVEL_LOW>;
 		pinctrl-names = "default";
-		pinctrl-0 = <&pmic_int &global_pwroff>;
+		pinctrl-0 = <&pmic_int &global_pwroff &dvs_1 &dvs_2>;
+		dvs-gpios = <&gpio0 11 GPIO_ACTIVE_HIGH>,
+				<&gpio0 12 GPIO_ACTIVE_HIGH>;
+
 		rockchip,system-power-controller;
 		wakeup-source;
 		#clock-cells = <1>;

arch/arm/boot/dts/rk3288-tinker-board.dtsi

@@ -421,6 +421,14 @@
 		pmic_int: pmic-int {
 			rockchip,pins = <RK_GPIO0 4 RK_FUNC_GPIO &pcfg_pull_up>;
 		};
+
+		dvs_1: dvs-1 {
+			rockchip,pins = <RK_GPIO0 11 RK_FUNC_GPIO &pcfg_pull_down>;
+		};
+
+		dvs_2: dvs-2 {
+			rockchip,pins = <RK_GPIO0 12 RK_FUNC_GPIO &pcfg_pull_down>;
+		};
 	};
 
 	sdio-pwrseq {