Add flag to set call extra on incoming call for DSDA devices

- For DSDA or virtual DSDA enabled devices, when there is an incoming
  call on sub1 and an incoming call on SIM2: if either SIM does not
support hold capability, the existing call needs to be terminated.
- Setting this flag enables the above behavior.
- DSDS devices are not affected- if 2 simultaneous calls are received
  (eg. on WFC + WFC), the existing call will always be terminated.

Bug: 315993953
Test: Updated TelephonyConnectionServiceTests.
Change-Id: I08a4bd20d55448e15112361ffeff4e6143d32928