drm/amdgpu: remove SRIOV and MCBP dependencies from the CS

We should not have any different CS constrains based
on the execution environment.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>