am f6354aca: Merge "CallManager: do not deliver ring event if fg call is live." into gingerbread

Merge commit 'f6354aca3a4d0571a66747d9cdc247a1d411d660' into gingerbread-plus-aosp

* commit 'f6354aca3a4d0571a66747d9cdc247a1d411d660':
  CallManager: do not deliver ring event if fg call is live.