ENGR00274226-01 MX6 HDMI: document for mxc specific properties.

Add hdmi core and video dts properties description document.

Signed-off-by: Sandor Yu <R01008@freescale.com>

diff --git a/Documentation/devicetree/bindings/video/mxc_hdmi_video.txt b/Documentation/devicetree/bindings/video/mxc_hdmi_video.txt
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+Device-Tree bindings for hdmi video driver
+
+Required properties:
+- compatible: value should be "fsl,imx6q-hdmi-video".
+- fsl,phy_reg_vlev: hdmi phy register,Voltage Level Control Register offset 0x0e,
+  adjust hdmi phy signal voltage level.
+- fsl,phy_reg_cksymtx: hdmi phy register, clock symbol and transmitter control
+  register offset 0x09, adjust hdmi signal pre-emphasis.
+
+Example:
+
+       hdmi_video {
+               compatible = "fsl,imx6q-hdmi-video";
+               fsl,phy_reg_vlev = <0x0294>;
+               fsl,phy_reg_cksymtx = <0x800d>;
+       };
+