dt-bindings: pinctrl: realtek,rtd1625: Fix input voltage property name

dt-bindings: pinctrl: realtek,rtd1625: Fix input voltage property name

The property 'input-voltage-microvolt' is a typo. Rename it to
'input-threshold-voltage-microvolt' to align with the standard pin
configuration defined in pincfg-node.yaml and parsed by pinconf-generic.c.

Fixes: f6ea7004e926 ("dt-bindings: pinctrl: realtek: Add RTD1625 pinctrl binding")
Signed-off-by: Yu-Chun Lin <eleanor.lin@realtek.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Linus Walleij <linusw@kernel.org>