Add util to access device flags for Mobly tests am: 8b87f50e35 am: adce868bc4 am: 011e0d0d33

Original change: https://android-review.googlesource.com/c/platform/tools/test/mobly_extensions/+/2726794

Change-Id: I3ab5064ab81d01eb4fcfb44bcb1d0c43ed320709
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
tree: f61b301079ae34b5ff0071cc32ba81b105ac14b6
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