dt-bindings: pinctrl: qcom: Add SM4450 pinctrl

Add device tree binding Documentation details for Qualcomm SM4450
TLMM device.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Tengfei Fan <quic_tengfan@quicinc.com>
Link: https://lore.kernel.org/r/20231212094900.12615-2-quic_tengfan@quicinc.com


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