Convert the google,cros-ec-i2c-tunnel binding to YAML and add it as a
property of google,cros-ec.yaml.
Reviewed-by: NEnric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: NRicardo Cañuelo <ricardo.canuelo@collabora.com>
Link: https://lore.kernel.org/r/20201021114308.25485-2-ricardo.canuelo@collabora.com
[robh: add ref to i2c-controller.yaml]
Signed-off-by: NRob Herring <robh@kernel.org>