dt-bindings: pinctrl: mt8192: Add mediatek,drive-strength-adv property

Add the mediatek,drive-strength-adv property to the pinctrl-mt8192
dt-binding to allow further drive current adjustments for I2C nodes on
MT8192. It is the same as in mt8183-pinctrl.

Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220315211936.442708-3-nfraprado@collabora.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>