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.

To change Icon not to use PackageManager.getResourcesForApplicationAsUser
lets StatusBarIconViewTest no need to mock
getResourcesForApplicationAsUser in mock PackageManager instance.

Test: make -j droid cts gts vts
Test: make -j docs
Test: atest SystemUITests \
    FrameworksServicesTests:com.android.server.pm \
    CtsGraphicsTestCases:android.graphics.drawable.cts.IconTest \
    FrameworksCoreTests:android.graphics.drawable.IconTest
Bug: 170928809
Change-Id: I4a2ec54b6e137a9c9efcfba0589c08ea8cac86ce