panfrost: Add MSAA mode selection field

This field enables MSAA, either writing samples to separate surfaces, to
a single large-bpp surface, or implicitly resolved and to a single
surface.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6161>
3 files changed