dt-bindings: pinctrl: qcom: add drive-open-drain to ipq4019

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

Documentation/devicetree/bindings/pinctrl/qcom,ipq4019-pinctrl.txt

@@ -44,7 +44,8 @@ information about e.g. the mux function.
 
 The following generic properties as defined in pinctrl-bindings.txt are valid
 to specify in a pin configuration subnode:
- pins, function, bias-disable, bias-pull-down, bias-pull-up, drive-strength.
+ pins, function, bias-disable, bias-pull-down, bias-pull-up, drive-open-drain,
+ drive-strength.
 
 Non-empty subnodes must specify the 'pins' property.
 Note that not all properties are valid for all pins.