dt-bindings: pinctrl: qcom,pmic-gpio: add PM8953

Document the 8 GPIOs found on PM8953.

Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230421-pm8953-gpio-v1-1-3d33e2de47e3@z3ntu.xyz


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