ARM: dts: sun8i: v3s: Remove redundant assigned-clocks

The V3s mixer node has an assigned clocks property, while the driver also
enforces it.

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

arch/arm/boot/dts/sun8i-v3s.dtsi

@@ -123,8 +123,6 @@ mixer0: mixer@1100000 {
 			clock-names = "bus",
 				      "mod";
 			resets = <&display_clocks 0>;
-			assigned-clocks = <&display_clocks 6>;
-			assigned-clock-rates = <150000000>;
 
 			ports {
 				#address-cells = <1>;