InCallUI: Set system bar enabled when InCallScreen goto background

During an incomming call and InCallScreen goto background,
the system bar is still disabled.

Set system bar enabled when InCallScreen goto background.

CRs-Fixed: 637132

Conflicts:
	src/com/android/incallui/InCallActivity.java

Change-Id: Iaf2af6f392ac0096521783cd4febca6c3003635d
InCallUI: Do not show subscription info during an Internet call

Show subscription info during an Internet call.

Do not show the subscription info when isSipCall is true.

CRs-Fixed: 643468

Conflicts:
	src/com/android/incallui/CallCardFragment.java

Change-Id: I7cdee61a2f04b20d7040201bd264b5679678de25