drm/i915/dp: Consider output_format while computing dsc bpp

While using DSC the compressed bpp is computed assuming RGB output
format. Consider the output_format and compute the compressed bpp
during mode valid and compute config steps.

For DP-MST we currently use RGB output format only, so continue
using RGB while computing compressed bpp for MST case.

v2: Use output_bpp instead for pipe_bpp to clamp compressed_bpp. (Ville)

Signed-off-by: Ankit Nautiyal <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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