app: Ignore ExportedService lint warnings for FCM services
app: Ignore ExportedService lint warnings for FCM services

The services are added as the instructions stated. In fact, the
FirebaseInstanceIdService documentation even says it performs
security checks at runtime, so assume everything is okay.

See:
https://firebase.google.com/docs/reference/android/com/google/firebase/iid/FirebaseInstanceIdService

Signed-off-by: Greg Meiste <8a8f45e57c045ec63dc7e56e5eda862ea8c7cd4f@gmail.com>

meisteg/RaspberryPiTempAlarm,meisteg/RaspberryPiTempAlarm,meisteg/RaspberryPiTempAlarm