don't select default track if subtitle controller is not present
don't select default track if subtitle controller is not present

subtitle controller won't be there if app is not using VideoView.

Bug: 15470448
Change-Id: If6724928220a8906bd2199ebc0916a4493092abb

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base