pinctrl: mediatek: fix pull_type data for MT7981

MediaTek has released pull_type data for MT7981 in their SDK.
Use it and set functions to configure pin bias.

Fixes: 6c83b2d9 ("pinctrl: add mt7981 pinctrl driver")
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Link: https://lore.kernel.org/r/7bcc8ead25dbfabc7f5a85d066224a926fbb4941.1692327317.git.daniel@makrotopia.org


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