ARM: sa1100: h3xxx: convert gpio-keys to use software nodes

Convert the legacy gpio-keys platform device on the StrongARM SA-1100
HP iPAQ H3xxx series boards to use software nodes and device properties.
This helps progress the removal of platform data support from the
gpio-keys driver.

Define static software nodes for the gpio-keys device and the power and
action button child nodes at file scope, referencing the SA-1100 GPIO
controller node directly. In h3xxx_mach_init(), register the software node
group and use platform_device_register_full() to register the device.

Assisted-by: Antigravity:gemini-3.5-flash
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20260706-sa1100-swnode-v1-4-332759bbd930@gmail.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

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