So drivers can use them.  This can be used to replace
duplicate code in the drm subsystem.
Acked-by: NChristian König <christian.koenig@amd.com>
Acked-by: NBjorn Helgaas <bhelgaas@google.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>