Add @UnsupportedAppUsage annotations

For packages:
  android.preference

This is an automatically generated CL. See go/UnsupportedAppUsage
for more details.

Exempted-From-Owner-Approval: Mechanical changes to the codebase
which have been approved by Android API council and announced on
android-eng@

Bug: 110868826
Test: m
Change-Id: I6a39e2a1e1eb65cde9d200fb794c6592982f1272
Merged-In: I31a80552a66554d876edd01950df368c31239c2b