pinctrl: qcom: ipq806x: mark gpio as a GPIO pin function

pinctrl: qcom: ipq806x: mark gpio as a GPIO pin function

The qcom pinctrl core supports marking functions that represent GPIO mode
via PINCTRL_GPIO_PINFUNCTION(), so that strict pinmuxing does not reject
GPIO requests for pins that are muxed to the GPIO function.

Add a IPQ_GPIO_PIN_FUNCTION() helper and use it for the ipq806x gpio
function, matching how the msm-based qcom drivers handle this.

This allows ipq806x to keep the GPIO-related configuration in DTS
without tripping over strict pinmux ownership
checks.

Fixes: cc85cb96e2e4 ("pinctrl: qcom: make the pinmuxing strict")
Signed-off-by: Hans Ulli Kroll <linux@ulli-kroll.de>
Acked-by: Linus Walleij <linusw@kernel.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://patch.msgid.link/20260719134548.8830-2-linux@ulli-kroll.de
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>