zink: fix PIPE_CAP_TGSI_BALLOT export conditional
this requires VK_EXT_shader_subgroup_ballot
cc: mesa-stable
fixes (lavapipe): KHR-GL46.shader_ballot_tests.ShaderBallotAvailability KHR-GL46.shader_ballot_tests.ShaderBallotFunctionRead
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this requires VK_EXT_shader_subgroup_ballot
cc: mesa-stable
fixes (lavapipe): KHR-GL46.shader_ballot_tests.ShaderBallotAvailability KHR-GL46.shader_ballot_tests.ShaderBallotFunctionRead