[media] s5p-cec.txt: document the HDMI controller phandle

Update the bindings documenting the new hdmi phandle.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
CC: linux-samsung-soc@vger.kernel.org
CC: devicetree@vger.kernel.org
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/devicetree/bindings/media/s5p-cec.txt

@@ -15,6 +15,7 @@ Required properties:
   - clock-names : from common clock binding: must contain "hdmicec",
 		  corresponding to entry in the clocks property.
   - samsung,syscon-phandle - phandle to the PMU system controller
+  - hdmi-phandle - phandle to the HDMI controller
 
 Example:
 
@@ -25,6 +26,7 @@ hdmicec: cec@100B0000 {
 	clocks = <&clock CLK_HDMI_CEC>;
 	clock-names = "hdmicec";
 	samsung,syscon-phandle = <&pmu_system_controller>;
+	hdmi-phandle = <&hdmi>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&hdmi_cec>;
 	status = "okay";