arm64: dts: rockchip: add Quartz64-A fan pinctrl

The Quartz64 Model A fan is bound to a single gpio. Prevent pinctrl
issues in the future by binding the pinctrl assignment for the gpio.

Signed-off-by: Peter Geis <pgwipeout@gmail.com>
Link: https://lore.kernel.org/r/20220511150117.113070-5-pgwipeout@gmail.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>