VT: Send more RTP SR information to upper layer

[Problem] Need some method to estimate frame process time of an opponent
[Cause] NTP & RTP time of SR was not proper.
        Becuase of this, SR have not been applicated usefully.
[Solution] Fix the time of SR to indicate its own timing.
           Send SR information from the opponent to upper layer.

Bug: 183578712

Signed-off-by: Byeongjo Park <bjo.park@samsung.com>
Change-Id: I005c798759cc1609e04f766e8b0fe751ff5eede8
Signed-off-by: Kim Sungyeon <sy85.kim@samsung.com>