DSDA: Add InCallUI DSDA support.

 -Add tab view support for DSDA
 -Add support to display voice calls based on the
  current active subscription.
 -Add few utilities in CallList, which required for handling
  voice calls across multiple subscription.

Change-Id: Ib683f7c3b41ed3bb04367be1e9c331908bc46004

Conflicts:

	AndroidManifest.xml
	src/com/android/incallui/InCallPresenter.java