[FRR] Add permission during broadcast enroll time

Fix warning msg about sending non-protected boradcast intent from
ActivityManager

Flag: com.android.server.biometrics.frr_dialog_improvement
Bug: 423463118
Test: After enroll fp or face, AuthenticationStatsCollector gets the
      intent w/ new permission.
      Sending intent through adb, AuthenticationStatsCollector does not
      get the intent. (adb shell am broadcast
      -a last_enroll_time_changed -p system_server --ei modality 1
      --ei android.intent.extra.USER_HANDLE 0)
Change-Id: Iaf8089bb3cb93e165325dd66fcb78f3696bef2b6