Fix bug where CDMA generic conference showed wrong duration

There was an issue with the duration shown in the InCallUI when a CMDA
generic conference was ended early. This resulted in the duration
showing as a huge number, rather than the proper value. This issue is a
regression caused by cl/157138159, which attempts to only start the
timer once.

This CL fixes the issue by ensuring that the Chronometer's base is reset
every time the timer row updates, instead of just once when start is
called. This matches the logic from prior to cl/157138159.

Repro steps:
1) Disable advanced calling on device with Verizon SIM
2) Place call from DUT to device A
3) Accept call on device A
4) Place call from DUT to device B
5) Before answering the call on device B, hang up the added call on DUT.

Results (without fix):
InCallUI switches to generic conference view (Phone number/name changes
to "Incall"). Duration becomes a huge number. See
https://drive.google.com/open?id=0B5N2YRME1XrUeDJWYnRBWGRQM00

Results (with fix):
InCallUI switches to generic conference with proper duration. See
https://drive.google.com/open?id=0B5N2YRME1XrUaDRtcjRWX3BxMTA

Bug: 64099380
Test: Manual, see steps
PiperOrigin-RevId: 163735661
Change-Id: I98bcd6517b55a21b58e4b32b00d66fdba4c45143

0 files changed, 0 insertions, 0 deletions