Buffers are created without a format in Vulkan, and we always pass in
R8_UNORM for them in Gallium. It's the view-formats we should have
checked, if anything.
But that's orthogonal to this. We shoudn't keep checking R8_UNORM
capabilities for buffers, all it's going to do is trigger asserts.
Fixes: 00dc0036b ("zink: flatten out buffer creation usage flags codepath")
Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11416>
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