VolumeControl: App exception aren't from SystemServer

Calling into IBluetoothVolumeControl will call the VolumeControlService
from Bluetooth app that does not live in the systemServer.
Therefore, exception should be rethrown as runtimeException

Keeping the only call into the systemServer as a rethrow from
systemServer

Bug: 298264617
Test: atest CtsBluetoothTestCases | Cts does not handled failure in the
      binder nor any of the Test framework we currently have
Change-Id: Iaa23917a29833671c3e21a4a89d2b2fd92c808a9