Add atom for OEM managed networks

Adding support for OEM managed network atom.

MDD: https://eldar.corp.google.com/assessments/412141244/revisions/1
Bug: 174485063
Test: statsd_testdrive 10100
Test: adb shell cmd stats pull-source 10100
Test: atest BytesTransferredTest
Change-Id: I1cb1b112afb0d6096310eefbf2816289c6d24f02