msm: vidc: Use pre-computed frame delta values in WFD use case

In WFD use-case with frame skipping enabled, we wish to fool the core
into thinking that that the frames are coming at a consistent rate so
that we don't run into any issues with the core's rate control
mechanism.

Introduce a client-settable property that dictates what the timestamp
delta between any two frames might be.

Change-Id: Iea3f97879227b7932543d3449d311758dc4a2f59
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>
diff --git a/include/media/msm/vcd_api.h b/include/media/msm/vcd_api.h
index 32a1759..c93b696 100644
--- a/include/media/msm/vcd_api.h
+++ b/include/media/msm/vcd_api.h
@@ -66,7 +66,7 @@
 	u32 alloc_len;
 	u32 data_len;
 	u32 offset;
-	s64 time_stamp;
+	s64 time_stamp; /* in usecs*/
 	u32 flags;
 	u32 frm_clnt_data;
 	struct vcd_property_dec_output_buffer dec_op_prop;