Mark framework created intent as safe

Flag intent created by framework as LOCAL_FLAG_FROM_PROTECTED_COMPONENT by
calling intent.prepareToEnterProcess(true...). This is to fix false positives
of StrictMode.unsafeIntentLaunchViolation.

Bug: 181132616
Test: Manually verified a violation was not reported when a test app launched
      Intents returned from TelecomManager.createManageBlockedNumbersIntent.
      Methods marked as systemApi are not tested.
Change-Id: I7b00008dd894f1c637ab2f0a23e6cafb58bb73e5