ARM: dts: rockchip: define the two possible rk3288 CEC pins

The CEC line can be routed to two possible pins. Define those pins.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rk3288.dtsi

@@ -1481,6 +1481,14 @@ gpio8: gpio8@ff7f0000 {
 		};
 
 		hdmi {
+			hdmi_cec_c0: hdmi-cec-c0 {
+				rockchip,pins = <7 RK_PC0 RK_FUNC_2 &pcfg_pull_none>;
+			};
+
+			hdmi_cec_c7: hdmi-cec-c7 {
+				rockchip,pins = <7 RK_PC7 RK_FUNC_4 &pcfg_pull_none>;
+			};
+
 			hdmi_ddc: hdmi-ddc {
 				rockchip,pins = <7 19 RK_FUNC_2 &pcfg_pull_none>,
 						<7 20 RK_FUNC_2 &pcfg_pull_none>;