Add betty-arc-r and betty-arc-s

BUG=b:175243030
TEST=setup_board --board=betty-arc-s

Change-Id: I9da12cd3bda287dc58fd61ca62e40d0175aa7da7
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2623494
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
Tested-by: Richard Fung <richardfung@google.com>
Commit-Queue: Richard Fung <richardfung@google.com>
1 file changed