drm/amd/display: Undo dc_update_surfaces_and_stream change.

Restoring conditional call to in_transfer_func since no reason
to call it unconditionally.

Signed-off-by: Andrey Grodzovsky <Andrey.Grodzovsky@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>