ARM: dts: sunxi: Remove redundant assigned-clocks

The display DRC nodes have an assigned clocks property, while the driver
also enforces it.

Since assigned-clocks is pretty fragile anyway, let's just remove it.
Signed-off-by: Maxime Ripard <maxime@cerno.tech>

arch/arm/boot/dts/sun6i-a31.dtsi

@@ -1182,9 +1182,6 @@ drc1: drc@1e50000 {
 				      "ram";
 			resets = <&ccu RST_AHB1_DRC1>;
 
-			assigned-clocks = <&ccu CLK_IEP_DRC1>;
-			assigned-clock-rates = <300000000>;
-
 			ports {
 				#address-cells = <1>;
 				#size-cells = <0>;
@@ -1268,9 +1265,6 @@ drc0: drc@1e70000 {
 				      "ram";
 			resets = <&ccu RST_AHB1_DRC0>;
 
-			assigned-clocks = <&ccu CLK_IEP_DRC0>;
-			assigned-clock-rates = <300000000>;
-
 			ports {
 				#address-cells = <1>;
 				#size-cells = <0>;

arch/arm/boot/dts/sun8i-a23-a33.dtsi

@@ -684,9 +684,6 @@ drc0: drc@1e70000 {
 			clock-names = "ahb", "mod", "ram";
 			resets = <&ccu RST_BUS_DRC>;
 
-			assigned-clocks = <&ccu CLK_DRC>;
-			assigned-clock-rates = <300000000>;
-
 			ports {
 				#address-cells = <1>;
 				#size-cells = <0>;