ARM: dts: rockchip: add the cec clk for dw-hdmi on rk3288

The dw-hdmi block needs the cec clk for the rk3288. Add it.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rk3288.dtsi

@@ -1178,8 +1178,8 @@ hdmi: hdmi@ff980000 {
 		reg-io-width = <4>;
 		rockchip,grf = <&grf>;
 		interrupts = <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&cru  PCLK_HDMI_CTRL>, <&cru SCLK_HDMI_HDCP>;
-		clock-names = "iahb", "isfr";
+		clocks = <&cru  PCLK_HDMI_CTRL>, <&cru SCLK_HDMI_HDCP>, <&cru SCLK_HDMI_CEC>;
+		clock-names = "iahb", "isfr", "cec";
 		power-domains = <&power RK3288_PD_VIO>;
 		status = "disabled";