drm/edid: Set YQ bits in the AVI infoframe according to CEA-861-F

CEA-861-F tells us:
"When transmitting any RGB colorimetry, the Source should set the
 YQ-field to match the RGB Quantization Range being transmitted
 (e.g., when Limited Range RGB, set YQ=0 or when Full Range RGB,
 set YQ=1) and the Sink shall ignore the YQ-field."

So let's go ahead and do that. Perhaps there are sinks that don't
ignore the YQ as they should for RGB?

I wasn't able to find similar text in CEA-861-E, so it would seem
to be a fairly "recent" addition.

Signed-off-by: Ville Syrjälä <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Jani Nikula <[email protected]>
Acked-by: Eric Anholt <[email protected]>

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