zink: do not use VK_FORMAT_D32_SFLOAT_S8_UINT without checking

Without this, we might end up trying to use VK_FORMAT_D32_SFLOAT_S8_UINT
even when it's not supported...

Cc: mesa-stable
Reviewed-by: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <!17953>
43 jobs for !17953 with zink-d32-sfloat-s8-uint-fix in 26 minutes and 27 seconds (queued for 3 seconds)
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