ayufan: dts: rockpro64: use max-link-speed gen2

Change-Id: I7bcd884f2ef72366ee91c963e4c8a233e06d919a

Author: ayufan

arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dts

@@ -585,6 +585,7 @@
 &pcie0 {
 	ep-gpios = <&gpio2 RK_PD4 GPIO_ACTIVE_HIGH>;
 	num-lanes = <4>;
+	max-link-speed = <2>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&pcie_clkreqn_cpm>;
 	vpcie3v3-supply = <&vcc3v3_pcie>;