usb: common: usb-conn-gpio: switch psy_cfg from of_node to fwnode

In order to remove .of_node from the power_supply_config struct,
use .fwnode instead.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20250225-psy-core-convert-to-fwnode-v1-3-d5e4369936bb@collabora.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>