airoha: backport and fix pinctrl driver

airoha: backport and fix pinctrl driver

Backport changes to the pinctrl driver to bring it closer to
the upstream version. Also fix the bug in the pinctrl driver:

pinctrl-airoha ...pinctrl: invalid function mdio in map table

Fixes: bd7f5b3 ("airoha: replace AN7583 pinctrl patch with upstream version")
Signed-off-by: Chukun Pan <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/20770
Signed-off-by: Christian Marangi <[email protected]>