Remove custom targeting logic for app data isolation.

Remove the ability to set the target SDK level where this is enabled
via DeviceConfig. Switch to using standard AppCompat targeting.

This was used to enable it via experiment for more apps in
droidfood. We have now ended this experiment so this functionality is
no longer needed.

Bug: 152391125
Test: atest AppDataIsolationTests AdoptableHostTest
Test: Boot device, see "Compat change id reported: 143937733" in logs (enabled & disabled)

Change-Id: I0ff429963c40e89d9e3445cc96620dfa5f05d129