[Intel-gfx] [PATCH 0/2 V2] enable broadcast RGB mode for hdtv

[Ma Ling]

Almost all digital TVs will accept braodcast RGB values from 16 to 235 on each channel,
otherwise for those uncompensated videos, when RGB values are set from 0 to 255,
they will show black and whiter clamping, which seriously degrades picture quality.
The patch will enable the broadcast RGB mode for hdtv according to user's setting.
It fixed bug #14486.

[PATCH 1/2] set broadcast RGB mode for HDMI and TMDS from SDVOX output.
[PATCH 2/2] set broadcast RGB mode for HDMI from integrated HDMI output.

Thanks
Ma Ling