anv: Enable VK_EXT_shader_subgroup_{ballot,vote}

anv: Enable VK_EXT_shader_subgroup_{ballot,vote}

Anvil now supports and passes Vulkan CTS tests matching

    dEQP-VK.subgroups.*.ext_shader_subgroup_ballot.*
    dEQP-VK.subgroups.*.ext_shader_subgroup_vote.*

and crucible tests matching

    func.shader-ballot.*
    func.shader-subgroup-vote.*

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>