panvk: Pass through alpha_zero_nop/one_store flags

When constructing the Internal Blend Descriptor for fixed-function
blending, set the alpha_zero_nop/one_store flags based on the given
equation.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Acked-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <!13508>
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