rb5: Set Ethernet MAC address on boot am: a961f043ae

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/2737313

Change-Id: Iab22364efcac98ab32f738d9e560ea3371f6a90d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>