arm64: dts: rockchip: enable u2phy low power mode for rk3326-863

Add rockchip,low-power-suspend property to DT of u2phy to make
the port enter lower power state when suspend.

Change-Id: I88eef53b24c8859ebe2c2b3cb5ecbdc42b406d04
Signed-off-by: Meng Dongyang <[email protected]>

Author: Meng Dongyang

arch/arm64/boot/dts/rockchip/rk3326-863-lp3-v10.dts

@@ -657,10 +657,12 @@
 	status = "okay";
 
 	u2phy_host: host-port {
+		rockchip,low-power-mode;
 		status = "okay";
 	};
 
 	u2phy_otg: otg-port {
+		rockchip,low-power-mode;
 		status = "okay";
 	};
 };