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

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

Change-Id: I6be9e8e4c4e4cdb310d5fa0ec7815481fc0df6de
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>