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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 <ankit.k.nautiyal@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230817142459.89764-2-ankit.k.nautiyal@intel.com