Remove PackageManager.getResourcesForApplicationAsUser API

To switch another user to do something should create the context of the
specified user by using Context.createContextAsUser rather than call
*AsUser API directly.

Test: croot ; make RunSettingsLibRoboTests -j40
Test: make -j droid cts gts vts
Test: make -j docs
Test: atest SystemUITests \
    FrameworksServicesTests:com.android.server.pm
Bug: 170928809
Change-Id: I369a3cf0a9dca1496b57675f4fa8e3fb1da982f3