platform/chrome: cros_ec: append newline to all logs

To be consistent, append newline ("\n") to all logs.

Reviewed-by: Guenter Roeck <groeck@google.com>
Reviewed-by: Prashant Malani <pmalani@chromium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>