gpio: swnode: compare the "undefined" swnode by its address, not name

gpio: swnode: compare the "undefined" swnode by its address, not name

We know the address of the underlying remote software node referenced by
the GPIO property (if it is a software node). We don't need to compare
its name, we can compare its address which is more precise anyway.

Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Tested-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20251215154624.67099-1-bartosz.golaszewski@oss.qualcomm.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>