utils: eth_mac_addr: Fix the GSI/Treble compatibility am: e721f61fee am: c2703478e1

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/2842354

Change-Id: I221513b4f3b5de09acc3cfd7d63492f0810b9759
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>