arm64: dts: rockchip: add the PCIe PHY for RK3399

This patch adds PCIe node for RK3399 to support
PCIe controller.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

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

@@ -1010,6 +1010,16 @@ emmc_phy: phy@f780 {
 			#phy-cells = <0>;
 			status = "disabled";
 		};
+
+		pcie_phy: pcie-phy {
+			compatible = "rockchip,rk3399-pcie-phy";
+			clocks = <&cru SCLK_PCIEPHY_REF>;
+			clock-names = "refclk";
+			#phy-cells = <0>;
+			resets = <&cru SRST_PCIEPHY>;
+			reset-names = "phy";
+			status = "disabled";
+		};
 	};
 
 	watchdog@ff848000 {