arm64: dts: rk356x-u-boot: Drop combphy1 assigned-clocks/rates

combphy1 is failing to probe due to unhandled assigned-clocks and
assigned-clocks-rates.

=> usb start
starting USB...
Bus usb@fd000000: Failed to get PHY1 for usb@fd000000
Port not available.
Bus usb@fd800000: USB EHCI 1.00

There is no real requirement for them in U-Boot to handle, hence
mark them as deleted-properties for the  probe to success

Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/dts/rk356x-u-boot.dtsi b/arch/arm/dts/rk356x-u-boot.dtsi
index ccb8db0..4e2d059 100644
--- a/arch/arm/dts/rk356x-u-boot.dtsi
+++ b/arch/arm/dts/rk356x-u-boot.dtsi
@@ -22,6 +22,11 @@
 	};
 };
 
+&combphy1 {
+	/delete-property/ assigned-clocks;
+	/delete-property/ assigned-clock-rates;
+};
+
 &cru {
 	u-boot,dm-pre-reloc;
 	status = "okay";