dt-bindings: pinctrl: mt8195: Fix name for mediatek,rsel-resistance-in-si-unit

dt-bindings: pinctrl: mt8195: Fix name for mediatek,rsel-resistance-in-si-unit

When this property was introduced, it contained underscores, but
the actual code wants dashes.

Change it from mediatek,rsel_resistance_in_si_unit to
mediatek,rsel-resistance-in-si-unit.

Fixes: 91e7edceda96 ("dt-bindings: pinctrl: mt8195: change pull up/down description")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220630122334.216903-1-angelogioacchino.delregno@collabora.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>