dt-bindings: pinctrl: qcom: Add SDX75 pinctrl devicetree compatible

Add device tree binding Documentation details for Qualcomm SDX75
pinctrl driver.

Signed-off-by: Rohit Agarwal <quic_rohiagar@quicinc.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/1684425432-10072-2-git-send-email-quic_rohiagar@quicinc.com


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