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: make -j droid cts gts vts
Test: make -j docs
Test: atest SystemUITests \
    FrameworksServicesTests:com.android.server.pm
Test: atest CtsBlobStoreTestCases
Bug: 170928809
Change-Id: Ia9d376b579ef4d88637d51a5fb3947faa71c76ca