cros_ec: Honor the google,remote-bus dt property

Boards where ECs that use a I2C port != 0 specify this in the
devicetree file via the google,remote-bus property.
Previously this was ignored and hardcoded to port 0.

Signed-off-by: Moritz Fischer <moritz.fischer@ettus.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Heiko Schocher <hs@denx.de>
Cc: u-boot@lists.denx.de
Acked-by: Simon Glass <sjg@chromium.org>

include/cros_ec.h

@@ -395,9 +395,11 @@ struct i2c_msg;
  * Tunnel an I2C transfer to the EC
  *
  * @param dev		CROS-EC device
+ * @param port		The remote port on EC to use
  * @param msg		List of messages to transfer
  * @param nmsgs		Number of messages to transfer
  */
-int cros_ec_i2c_tunnel(struct udevice *dev, struct i2c_msg *msg, int nmsgs);
+int cros_ec_i2c_tunnel(struct udevice *dev, int port, struct i2c_msg *msg,
+		       int nmsgs);
 
 #endif