Move VTS test to verify DTBO to test/vts/host/verifyDTBO

Also moving verifyDTBO.sh to libufdt/test since it is
a standalone test that can be run independent of VTS.

Bug: 67779848
Bug: 72697311
Test: vts-tradefed run vts -m verifyDTBO

Change-Id: I4c420404a482f7260796c93e054516bb6ec3b84f