utils: eth_mac_addr: Fix the GSI/Treble compatibility am: e721f61fee am: d870933666 am: 358cb22fd6

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

Change-Id: Ief05398fe414f7af6f13bc838e0c39f146f42c26
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>