ARM: dts: sunxi: Remove redundant assigned-clocks

The display backend 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/sun5i.dtsi

@@ -771,9 +771,6 @@ be0: display-backend@1e60000 {
 			interconnect-names = "dma-mem";
 			status = "disabled";
 
-			assigned-clocks = <&ccu CLK_DE_BE>;
-			assigned-clock-rates = <300000000>;
-
 			ports {
 				#address-cells = <1>;
 				#size-cells = <0>;

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

@@ -1139,9 +1139,6 @@ be1: display-backend@1e40000 {
 				      "ram";
 			resets = <&ccu RST_AHB1_BE1>;
 
-			assigned-clocks = <&ccu CLK_BE1>;
-			assigned-clock-rates = <300000000>;
-
 			ports {
 				#address-cells = <1>;
 				#size-cells = <0>;
@@ -1231,9 +1228,6 @@ be0: display-backend@1e60000 {
 				      "ram";
 			resets = <&ccu RST_AHB1_BE0>;
 
-			assigned-clocks = <&ccu CLK_BE0>;
-			assigned-clock-rates = <300000000>;
-
 			ports {
 				#address-cells = <1>;
 				#size-cells = <0>;

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

@@ -372,8 +372,6 @@ &be0 {
 		      "ram", "sat";
 	resets = <&ccu RST_BUS_DE_BE>, <&ccu RST_BUS_SAT>;
 	reset-names = "be", "sat";
-	assigned-clocks = <&ccu CLK_DE_BE>;
-	assigned-clock-rates = <300000000>;
 };
 
 &ccu {