dt-bindings: pinctrl: qcom,pmic-gpio: drop pm8008

dt-bindings: pinctrl: qcom,pmic-gpio: drop pm8008

The binding for PM8008 is being reworked so that internal details like
interrupts and register offsets are no longer described. This
specifically also involves dropping the gpio child node and its
compatible string which is no longer needed.

Note that there are currently no users of the upstream binding and
driver.

Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20240529162958.18081-10-johan+linaro@kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>