Fix issue that MO call disconnect automatically when user accept

another MT call in DSDA mode.

The issue is due to call object serialization is wrong, so get
the invalid phone id in CallList.java.

Correct call serialization in Telecom.

CRs-Fixed: 732358

Change-Id: Ic59d0ad6bfbdc15f4b611e804c4acc060527aeb8