drm/amdgpu: skip MES for S0ix as well since it's part of GFX

It's also part of gfxoff.

Cc: stable@vger.kernel.org # 6.0, 6.1
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>