1. Fixed acquire free split pipe bug.
	2. Change return value for dc_add_stream_to_ctx
	   from bool to enum.
	4. Remove redundant apply_ctx_for_surface calling
	5. Unlock pipe after back end programming.
Signed-off-by: NYongqiang Sun <yongqiang.sun@amd.com>
Reviewed-by: NTony Cheng <Tony.Cheng@amd.com>
Acked-by: NHarry Wentland <Harry.Wentland@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>