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/vidc/inc/msm_vidc_inst.h

@@ -63,6 +63,7 @@ struct msm_vidc_buffers_info {
 	struct msm_vidc_buffers        input;
 	struct msm_vidc_buffers        output;
 	struct msm_vidc_buffers        read_only;
+	struct msm_vidc_buffers        release;
 	struct msm_vidc_buffers        input_meta;
 	struct msm_vidc_buffers        output_meta;
 	struct msm_vidc_buffers        bin;
@@ -149,6 +150,6 @@ struct msm_vidc_inst {
 	u64                                last_qbuf_time_ns;
 	bool                               vb2q_init;
 	u32                                max_input_data_size;
+	u32                                dpb_list_payload[MAX_DPB_LIST_ARRAY_SIZE];
 };
-
 #endif // _MSM_VIDC_INST_H_