dt-bindings: pinctrl: mt8195: add rsel define

This patch adds rsel define for mt8195.

Signed-off-by: Zhiyong Tao <zhiyong.tao@mediatek.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210924080632.28410-2-zhiyong.tao@mediatek.com


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