Return false for emergency calls for automotive

For automotive devices that lack the feature Telephony calling, return
false for emergency calls for the status bar. Not doing so results in
the UI crashing.

Flag: EXEMPT bugfix

Bug: 396801499
Bug: 310710841
Bug: 398045526
Test: AndroidAutomotiveNavigationBarTests:
        android.platform.tests.NavigationBarTest#testNotificationButton
Change-Id: I978a4c1f2ca151193cb71d151375b0f675cd9634