video: driver: add dpb tag list metadata support

- add DPB tag list capability in database
- subscribe in metadata mode for the dpb tag list
  property if enabled

Change-Id: Id4b9b7392b7b26cccf0860d578b8a0cb8d798d04
Signed-off-by: Darshana Patil <darshana@codeaurora.org>

driver/vidc/inc/msm_vidc_internal.h

@@ -427,6 +427,7 @@ enum msm_vidc_inst_capability_type {
 	META_HDR10PLUS,
 	META_EVA_STATS,
 	META_BUF_TAG,
+	META_DPB_TAG_LIST,
 	META_SUBFRAME_OUTPUT,
 	META_ENC_QP_METADATA,
 	META_ROI_INFO,