MSIM(DSDA): Ensure phone screen wake up on DSDA incoming call.

In case of an incoming call on one sub with a live call on another sub,
force InCallActivity to finish() if the screen is off. This is required
since the screen will wake up only when InCallActivity is created.
Also cancel the on going InCall notification and notify the new
notification so that the full screen InCall intent is launched.

Change-Id: I778075f503b27c85cb8dd0e58b35df3d3b0f8810
CRs-Fixed: 583161