avsync: av not sync problem cased by vp9 trig

avsync: av not sync problem cased by vp9 trig

PD#161895: av not sync problem cased by vp9 trig

1)vp9 initialization stream do not post VIDEO_START event,
so do not post VIDEO_STOP in unregister when not post
VIDEO_START which occured in vp9 tirg reset codec operation.
2)AV audio master adjust pcr according apts diff in
tsync tsync_set_apts need to reopen which was commented in
the begining tree of 4.9 codec
3)summit as Tim's patch

Change-Id: I9fb62aecb27f75d1ea9dff938452e0dd4f11b901
Signed-off-by: shuanglong.wang <shuanglong.wang@amlogic.com>