drm/dsc: Modify DRM helper to return complete DSC color depth capabilities

DSC DPCD color depth register advertises its color depth capabilities
by setting each of the bits that corresponding to a specific color
depth. This patch defines those specific color depths and adds
a helper to return an array of color depth capabilities.

v2:
* Simplify the logic (Ville)

Signed-off-by: Manasi Navare <[email protected]>
Cc: Ville Syrjala <[email protected]>
Acked-by: Sean Paul <[email protected]> (For merging through
drm-intel)
Reviewed-by: Ville Syrjala <[email protected]>
Reviewed-by: Anusha Srivatsa <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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