dt-bindings: pinctrl: qcom-pmic-gpio: Add pmx75 support

Add support for the pmx75 GPIO support to the Qualcomm PMIC GPIO
binding.

Signed-off-by: Rohit Agarwal <quic_rohiagar@quicinc.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/1688707209-30151-3-git-send-email-quic_rohiagar@quicinc.com


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