dt-bindings: ps2-gpio: document bus signals open drain

The PS/2 bus defines data and clock line to be open drain, this should
be reflected in the gpio flags set in the binding.

Especially, this is important since the clock line sometimes is driven
by the host while being used as interrupt source.

Reviewed-by: Krzysztof Kozlowski <[email protected]>
Signed-off-by: Danilo Krummrich <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Signed-off-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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