am fa6c7111: WifiService: use wifi association state to determine if we should suspend wifi instead of the existance of an IP address.

Merge commit 'fa6c7111fe58e09a92741c7655221c3629d3220e'

* commit 'fa6c7111fe58e09a92741c7655221c3629d3220e':
  WifiService: use wifi association state to determine if we should suspend wifi instead of