video: driver: handle dpb list property

- subscribe for dpb list property in combined
 mode on output port.
- copy dpb list property payload from fw to
 static array.
- using this array, mark read_only list buffers
 as non-reference if not part of array. if count
 of such buffers is greater than output min count,
 send to fw for release.
- once fw returns them, destroy these buffers.
- unmap stale output mappings due to lazy unmap feature.
- unify release internal functions into common function.

Change-Id: Id32f04efb19eecaff453cc4383ee8296a0246263
Signed-off-by: Darshana Patil <darshana@codeaurora.org>

driver/platform/waipio/src/msm_vidc_waipio.c

@@ -1168,6 +1168,15 @@ static struct msm_platform_inst_capability instance_data_waipio[] = {
 		V4L2_CID_MPEG_VIDC_ENC_INPUT_COMPRESSION_RATIO,
 		0, CAP_FLAG_DYNAMIC_ALLOWED},
 
+	{DPB_LIST, DEC, CODECS_ALL,
+		V4L2_MPEG_MSM_VIDC_DISABLE, V4L2_MPEG_MSM_VIDC_ENABLE,
+		1, V4L2_MPEG_MSM_VIDC_DISABLE,
+		0,
+		HFI_PROP_DPB_LIST,
+		CAP_FLAG_OUTPUT_PORT,
+		{0}, {0},
+		NULL, NULL},
+
 	{META_LTR_MARK_USE, ENC, H264|HEVC,
 		V4L2_MPEG_MSM_VIDC_DISABLE, V4L2_MPEG_MSM_VIDC_ENABLE,
 		1, V4L2_MPEG_MSM_VIDC_DISABLE,