This adds support for multiple DRM planes for a single format plane
and uses that to enable DCC support with modifiers.
With the implicit flush patches we can also enable displayable DCC
both with and without DCC as the X server and compositors know not
to do frontbuffer rendering onto images with multiple DRM planes.
For now we require that the extra planes are essentially fixed though.
We require that the offset/stride are the same as ac_surface computes
and that all planes are in the same buffer. This is mainly for
simplicity and could be somewhat more relaxed in the future given
a strong usecase.
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6176>
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