arm64: dts: rockchip: Add regulators for PCIe for Radxa Rock Pi 4 board

Add 0.9V and 1.8V voltage regulators for Radxa Rock Pi 4 board PCIe.
Signed-off-by: Matwey V. Kornilov <matwey@sai.msu.ru>
Link: https://lore.kernel.org/r/20191120161302.5157-1-matwey@sai.msu.ruSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dts

@@ -53,6 +53,16 @@ vcc5v0_sys: vcc-sys {
 		vin-supply = <&vcc12v_dcin>;
 	};
 
+	vcc_0v9: vcc-0v9 {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc_0v9";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <900000>;
+		regulator-max-microvolt = <900000>;
+		vin-supply = <&vcc3v3_sys>;
+	};
+
 	vcc3v3_pcie: vcc3v3-pcie-regulator {
 		compatible = "regulator-fixed";
 		enable-active-high;
@@ -473,6 +483,8 @@ &pcie0 {
 	num-lanes = <4>;
 	pinctrl-0 = <&pcie_clkreqnb_cpm>;
 	pinctrl-names = "default";
+	vpcie0v9-supply = <&vcc_0v9>;
+	vpcie1v8-supply = <&vcc_1v8>;
 	vpcie3v3-supply = <&vcc3v3_pcie>;
 	status = "okay";
 };