arm64: dts: rockchip: drop wrong spdif clock from edp1 on rk3588

As described, the analogix-dp controller on rk3588 only supports 2 clocks
and the edp0 node handles that correctly.

The edp1 node on the other hand seems to have a dangling 3rd clock called
spdif, that probably only exists in the vendor-tree.

As that is not handled at all, remove it for now so that we adhere to the
binding.

Fixes: a481bb0b1ad9 ("arm64: dts: rockchip: Add eDP1 dt node for rk3588")
Signed-off-by: Heiko Stuebner <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/arm64/boot/dts/rockchip/rk3588-extra.dtsi

···
 	edp1: edp@fded0000 {
 		compatible = "rockchip,rk3588-edp";
 		reg = <0x0 0xfded0000 0x0 0x1000>;
-		clocks = <&cru CLK_EDP1_24M>, <&cru PCLK_EDP1>, <&cru CLK_EDP1_200M>;
-		clock-names = "dp", "pclk", "spdif";
+		clocks = <&cru CLK_EDP1_24M>, <&cru PCLK_EDP1>;
+		clock-names = "dp", "pclk";
 		interrupts = <GIC_SPI 164 IRQ_TYPE_LEVEL_HIGH 0>;
 		phys = <&hdptxphy1>;
 		phy-names = "dp";