Enables the gpio-base mic detection on the Acer Chromebook 13.  This
gpio is set by the jack-detection chip when it notices either of the
TRRS type headsets with a microphone.
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>