ARM: dts: rockchip: move the hdmi ddc-i2c-bus property to the actual boards

Currently the hdmi driver is using one of the soc i2c busses for ddc probing
and while documentation always specifies i2c5 as hdmi-i2c it could very well
be any other bus as well.

Therefore this is a property of the board and should be specified there.
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rk3288-evb.dtsi

@@ -105,6 +105,7 @@
 };
 
 &hdmi {
+	ddc-i2c-bus = <&i2c5>;
 	status = "okay";
 };
 

arch/arm/boot/dts/rk3288-firefly.dtsi

@@ -180,6 +180,7 @@
 };
 
 &hdmi {
+	ddc-i2c-bus = <&i2c5>;
 	status = "okay";
 };
 

arch/arm/boot/dts/rk3288.dtsi

@@ -646,7 +646,6 @@
 		compatible = "rockchip,rk3288-dw-hdmi";
 		reg = <0xff980000 0x20000>;
 		reg-io-width = <4>;
-		ddc-i2c-bus = <&i2c5>;
 		rockchip,grf = <&grf>;
 		interrupts = <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>;
 		clocks = <&cru  PCLK_HDMI_CTRL>, <&cru SCLK_HDMI_HDCP>;