enguarde/expresso/quawks: Add servo overlays

Add servo overlay for these boards.

BUG=None.
TEST="sudo emerge hdctools", then "sudo servod -b quawks"

Change-Id: I12f950d6deadc4c142787c086dfd2cb005f7b9ba
Reviewed-on: https://chromium-review.googlesource.com/198603
Reviewed-by: Yusuf Mohsinally <mohsinally@chromium.org>
Commit-Queue: Shawn Nematbakhsh <shawnn@chromium.org>
Tested-by: Shawn Nematbakhsh <shawnn@chromium.org>
3 files changed