Currently the AMDGPU_CTX_PRIORITY_* defines are used in both
drm_amdgpu_ctx_in::priority and drm_amdgpu_sched_in::priority.
Extend the comment to mention the CAP_SYS_NICE or DRM_MASTER requirement
is only applicable with the former.
Cc: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl> Cc: Christian König <christian.koenig@amd.com> Cc: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Emil Velikov <emil.velikov@collabora.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>