Drop duplicate service state check.

We already are checking this in sendDeviceStateChanged(), and
onServiceStateChanged() and onSignalStrengthsChanged() have no defined
order, so the signal strength information is lost in case
onSignalStrengthsChanged() is called first.

Change-Id: Id419135780ed7ec58016e32fa37ea06c74ac07d4
Merge branch 'cm' into HEAD