Enforce PACKAGE_USAGE_STATS for usage data.

Some system services are offering package usage data through both
public/system APIs and through dump() calls.  In principle, usage
data hould always be protected with PACKAGE_USAGE_STATS, so start
enforcing that.  (Otherwise if a user blocked PACKAGE_USAGE_STATS
access to an app, that app could still obtain the data via dump()
if they held the DUMP permission.)

Bottom line, let's respect the user's wishes.

Protecting the entire output like this is pretty blunt, but future
CLs can add more nuance to the output if desired.

Test: cts-tradefed run commandAndExit cts-dev -m CtsSecurityTestCases -t android.security.cts.ServicePermissionsTest
Bug: 32806790
Change-Id: I46173562713bea7d89e12a4313c78eb52ea8d77d