BluetoothManager: Make requestControllerActivityInfo one call

Instead of making multiple calls into the Bluetooth service,
make one call that can timeout. This helps prevent cases
when the Bluetooth process hangs and the system_server is calling into
it and causes a WATCHDOG restart.

Bug:28658141

Change-Id: I84d2c025f4ffb452975444e794a64c82569deb0a