We've added drive-open-drain support, so note it in the DT binding.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200703080646.23233-2-computersforpeace@gmail.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>