VT: Change kStaticBuffer to 100ms except for ViLTE

[Problem] RTSP playback shows cracked & after images.
[Cause] By recent changes around this commit,
        RTP receiver changed a policy of packet buffering.
        The policy tends to decode packet instantly
        than wait its neighbor packets.
        It works as a disadvantage for RTSP streaming
        which easy to show scrambled packet arrival.
[Solution] Current buffering time 50ms is too short.
           The length of the time is focused on ViLTE RTP conn.
           So give longer time for the other usage conn.

Bug: 192538925

Signed-off-by: Kim Sungyeon <sy85.kim@samsung.com>
Change-Id: I9086118bf788bcdb2d738d548b41099925c85fda