Frameworks: Fix to avoid crash when the tab is not set.

Tab is not highlighted in Videoapp unlike Music app.
Instead the list is highlighted with mSelectedTab a negative value
when onFocusChange is called.
Add a check for mSelectedTab.

Change-Id: I930657b8a9be4be4d973f876242a15a667ec6f94
CRs-Fixed: 657606
audio: Inform audio HAL if it is a voice call initiated by Telephony

setMode() API with IN_CALL mode can be called by any of the Apps.
In HAL, it is required to distinguish if it is a real voice call
or not. Inform to audio HAL if it is a voice call by checking
getPhonestate() updated by telephony.

CRs-Fixed: 662804
Change-Id: I20a661f49f6566bdd1e23d6de18b509e2728ef19