mm-video: vidc: Adjust timestamp if actual ts < previous ts

The timestamp adjustment logic only bothered adjusting if
abs(delta) > 2ms.  Hence, if the successive timestamp was less than the
previous timestamp by more than 2ms, the adjustment never occured.

This commit forces the adjustment to occur if the timestamp appears to
be going backwards.

Change-Id: I9552a34c48be9813d1300a91126f10691d3d8bf7
1 file changed