drm/i915: prepare csc unit for YCBCR420 output

drm/i915: prepare csc unit for YCBCR420 output

To support ycbcr output, we need a pipe CSC block to do
RGB->YCBCR conversion.

Current Intel platforms have only one pipe CSC unit, so
we can either do color correction using it, or we can perform
RGB->YCBCR conversion.

This function adds a csc handler, which uses recommended bspec
values to perform RGB->YCBCR conversion (target color space BT709)

V2: Rebase
V3: Rebase
V4: Rebase
V5: Addressed review comments from Ander
    - Remove extra line added in the patch
    - Add the spec details in the commit message
    - Combine two if(cond) while calling intel_crtc_compute_config
V6: Handle YCBCR420 outputs only (Ville)
V7: Addressed review comments from Ville:
    - Add description about target colorspace
    - Remove the comments from CSC function
    - DRM_DEBUG->DEBUG_KMS for atomic failure due to CSC unit busy
    - Remove unnecessary debug message about YCBCR420 possibe
V8: Addressed review comments from Ville:
    - Remove extra comment, not required.
    - Do not add extra variable for CTM, reuse pipe_config
    Added r-b from Ville
V9: Remove extra whitespace (Imre)
V10: Added r-b from Imre

Cc: Ville Syrjala <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Ander Conselvan de Oliveira <[email protected]>
Cc: Imre Deak <[email protected]>
Reviewed-by: Ville Syrjala <[email protected]>
Reviewed-by: Imre Deak <[email protected]>
Signed-off-by: Shashank Sharma <[email protected]>
Signed-off-by: Imre Deak <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Daniel Vetter <[email protected]>