BT: Fix memory leak when BT on & off done many times

Solves a memory leak in BatteryStatsService when Bluetooth
is turn on/off. Solution adds missing close of proxy then
Bluetooth is turned off.

Change-Id: I65f9db298459c7c15f6a10c752992f1d38469445
CRs-Fixed: 476145
4.3 merge derps

Change-Id: I6af5fdbd20b20d41087bae09956306945e3bf2d1
Merge branch 'jb43' of https://github.com/ParanoidAndroid/android_frameworks_base into jb43-legacy