Add @UnsupportedAppUsage annotations

For packages:
  android.accessibilityservice

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: Ic677593dc2d206335275ecbad4d4a1020972ef38
Merged-In: I9437532ae617eda28aa5ae796563e985cc0ddbca