Don't expand the contact picture behind the call buttons during call.

Doing that avoids stretching more than needed. To avoid a visual 'jump'
of the contact picture when answering the call, animate the contact
picture layout transition.

Change-Id: I6a83281ce594ad2b00aaeb161d5e1c0cb6e4bdef

Patchset: 4
http://review.cyanogenmod.org/#/c/67679/