arm64: dts: rockchip: Add regulators for pcie on rk3399-rock960

As per Rock960 schematics add 0V9 and 1V8 voltage supplies to the
RK3399 PCIe block.
Signed-off-by: Anand Moon <linux.amoon@gmail.com>
Link: https://lore.kernel.org/r/20191117140728.917-1-linux.amoon@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3399-rock960.dtsi

@@ -76,6 +76,15 @@ vcc5v0_host: vcc5v0-host-regulator {
 		regulator-always-on;
 		vin-supply = <&vcc5v0_sys>;
 	};
+
+	vcc_0v9: vcc-0v9 {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc_0v9";
+		regulator-always-on;
+		regulator-min-microvolt = <900000>;
+		regulator-max-microvolt = <900000>;
+		vin-supply = <&vcc3v3_sys>;
+	};
 };
 
 &cpu_l0 {
@@ -384,6 +393,8 @@ &pcie0 {
 	num-lanes = <4>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&pcie_clkreqn_cpm>;
+	vpcie0v9-supply = <&vcc_0v9>;
+	vpcie1v8-supply = <&vcca_1v8>;
 	vpcie3v3-supply = <&vcc3v3_pcie>;
 	status = "okay";
 };