GitLab

Clear not supported devices set on new Ethernet MAC address source.

BUG=b:143695438
TEST=unittests
TEST=manual verify on arcada board that after changing setting
     non-supported 'builtin_adapter_mac', it's still possible to set
     another supported value and MAC will change.

Change-Id: I8bd5ef6c4833ffbc789b1c052724c5072523c4ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893886
Commit-Queue: Oleh Lamzin <lamzin@google.com>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713001}