glsl: prohibit lowp, mediump precision on atomic_uint
Fixes following dEQP tests:
dEQP-GLES31.functional.debug.negative_coverage.callbacks.atomic_counter.atomic_precision
dEQP-GLES31.functional.debug.negative_coverage.get_error.atomic_counter.atomic_precision
dEQP-GLES31.functional.debug.negative_coverage.log.atomic_counter.atomic_precision
Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98131
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>