Adding RECEIVER_EXPORTED flag to BroadcastReceiver

We currently won't be able to run test locally on Android 14 devices as the flag is required for all braodcast recievers, so the change here.

Test: Presubmit
Bug: 292118103
Flag: not needed
Change-Id: I85f9d1b9717b85b30a15e825ebd500508dd3ca5d