platform/x86: pcengines-apuv2: reduce indiraction in swnode assignment

platform/x86: pcengines-apuv2: reduce indiraction in swnode assignment

struct platform_device_info now has the 'swnode' field allowing passing
software nodes directly to platform_device_register_full() without going
through software_node_fwnode(). It supports both registered and
unregistered software nodes. Use it to drop one layer of indirection.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Link: https://patch.msgid.link/20260429-pcengines-apuv2-swnodes-v1-1-cd1a6fad856d@oss.qualcomm.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>