cameraservice: Avoid calling getSystemCameraKind if the camera was not mapped yet

* By calling `getSystemCameraKind()` directly in
  `broadcastTorchModeStatus()` we ensure that previous calls to
  `getTorchStatusLocked` and `setTorchStatusLocked` had succeeded,
  meaning that the camera device is already present in mCameraStates.

  When the camera device is already mapped in mCameraStates
  calls to `getSystemCameraKind()` will avoid interrogating the
  CameraProviderManager, which was causing a deadlock
  upon attempting to lock mInterfaceLock.

Change-Id: I2aed9d53f13859d26efe6a8ab300afab6944f5f7