anv: fix invalid programming of BLEND_STATE

We can't enable Logic Op & Color Buffer Blend. The Vulkan spec seems
to say Logic Op discards blending.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: mesa-stable@lists.freedesktop.org
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/3767
Reviewed-by: Sagar Ghuge <sagar.ghuge@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8691>
(cherry picked from commit 998f38bd9934e9eff156505244032c28df9fba31)
2 files changed