panfrost: Detect implementations support AFBC
AFBC is an optional feature on Bifrost. If it is missing, a bit will be set in the poorly named AFBC_FEATURES register. Check this so we can act appropriately. Signed-off-by:Alyssa Rosenzweig <alyssa@collabora.com> Cc: mesa-stable Part-of: <mesa/mesa!13497>
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