* moves the Magnifier from com.android.internal.widget to
android.widget
* removes useless public getters; useless for now because we have
no magnifier configuration but the hardcoded one
Bug: 67839742
Bug: 63531115
Test: bit CtsWidgetTestCases:android.widget.cts.MagnifierTest
Change-Id: Ie6f474c4c781038650007a15937d61c650ee5fdd