Return early when the caller doesn't have any permission.

We don't need to query app search db if caller doesn't have any permission.

Change-Id: I92eeca29b1b5d44592001434eb252a4b884ea7bc
Flag: android.app.appfunctions.flags.enable_app_function_manager
Test: Verified by running locally. Will add CTS in next cl.
Bug: 360864791