Move to_cros_ec_dev macro to cros_ec.h and use it when the private ec
object is needed from device object.
Signed-off-by: NGwendal Grignou <gwendal@chromium.org>
Reviewed-by: NEnric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: NBenson Leung <bleung@chromium.org>