rb5: Set Ethernet MAC address on boot am: a961f043ae am: 9fd963eefd

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

Change-Id: I0fbb50ad2c0f161d07440fd5f7c61414e89aa540
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>