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zink: fix non-modifer dmabuf usage

Mike Blumenkrantz requested to merge zmike/mesa:zink-dmabuf into main

drivers/hardware lacking VK_EXT_image_drm_format_modifier can still use dmabuf, but that setup has to do the old copy to linear scanout instead of copy to modifier scanout

this requires a couple extra checks to be added to handle the case

Fixes: 619438bf7ce ("zink: check EXT_image_drm_format_modifier for dmabuf support")

fixes #5836 (closed)

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