drm/i915: Define WA 0870 and kill dead code.
Let's introduce the WA number that is the cause of having NV12 disabled on both SLK and BXT. According to Spec: WA 0870: "Display flickers with NV12 video playback in Y tiling mode. WA: Use YUV422 surface format instead of NV12." v2: remove the useless dead code and consequently avoiding device info flag. (Ville) Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: NRodrigo Vivi <rodrigo.vivi@intel.com> Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181031162845.12419-3-rodrigo.vivi@intel.com
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