anv: Drop alpha_to_coverage from the NULL FS optimization
Starting with Ivy Bridge, we implement alpha-to-coverage by writting gl_SampleMask with a pattern based on alpha. This will show up in wm_prog_data::uses_omask so we don't need to look at the key. Fixes: 36ee2fd6 ("anv: Implement the basic form of VK_EXT_transform_feedback") Reviewed-by:Lionel Landwerlin <lionel.g.landwerlin@intel.com> Part-of: <mesa/mesa!16506> (cherry picked from commit 9fe6caf4)
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