dt-bindings: pinctrl: qcom,sm8250: add input-enable

The SM8250 pinctrl driver supports input-enable and DTS already use it
(sm8250-sony-xperia-edo-pdx203).

Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221016172212.49105-15-krzysztof.kozlowski@linaro.org


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>