List apps affected by secure user ID

Add a method to the Keystore maintenance interface to list the UIDs of
apps that are affected by a given secure user ID.

With this method, it would be possible to tell if removing a given
user's LSKF or enrolling new biometrics will invalidate Keystore keys,
thus affecting some apps.

Bug: 302109605
Test: atest keystore2_test
Change-Id: If5888506e0c72a56eca3339778889c7d8038acc5
3 files changed