dt-bindings: pinctrl: qcom,pmic-gpio: Allow gpio-hog nodes

Allow specifying a GPIO hog, as already used on
qcom-msm8974-lge-nexus5-hammerhead.dts.

Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Message-ID: <20240409-qcom-pmic-gpio-hog-v2-1-5ff812d2baed@z3ntu.xyz>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>