drm/i915: Add CRTC output format YCBCR 4:4:4

This patch adds support for YCBCR 4:4:4 CRTC output format.
To do this, this patch extends the existing YCBCR 4:2:0
framework by:
- Adding new parameter in for YCBCR 4:4:4 enum crtc_iutput_format.
- Adding case for YCBCR 4:4:4 in while setting AVI infoframes.
- Adding necessary checks in modeset sequence.

V3: Added this patch in the series
V4: Added r-b from Maarten (for v3)
    Addressed review comment from Ville:
    Do not use (config->output_format > CRTC_OUTPUT_RGB)
V5: Rebase
V6: Rebase and small change, to accommodate changes in patch 2
V7: Fixed checkpatch alignment warnings
V8: Rebase
V9: Rebase
V10: Rebase
V11: Addressed review comment from Ville
     Missing output_format_str[INTEL_OUTPUT_FORMAT_YCBCR444]
     Added Ville's R-B.

Cc: Ville Syrjälä <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
Signed-off-by: Shashank Sharma <[email protected]>
Signed-off-by: Jani Nikula <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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