Use killUid instead of killApplication to kill app

When the cross profile app op gets revoked, we need to
kill the app then send an app op changed broadcast to
the app. The problem with using killApplication is that
it is async and does not guarantee that the app is killed
before the broadcast is sent.

It also fixes an unrelated issue when
CrossProfileApps#clearInteractAcrossProfilesAppOps is called
from managed provisioning which is non system process, this
causes a security exception if killApplication is used.

Fixes: 156995567
Fixes: 157318765
Test: atest ManagedProfileCrossProfileTest
Test: atest ManagedProfileProvisioningTest
Change-Id: Iceedd57baeb64daccef072bc787b1e1cb1bfe814