bcma: gpio: Add and register software node for GPIO controller

We want to convert the legacy gpio-keys platform device on BCM47XX
boards to use software nodes. To do this properly and allow
referencing the GPIO controller by address rather than relying on
name-based matching (which is being removed from the gpiolib core),
we need to associate the GPIO controller with a software node.

Introduce bcma_gpio_swnode, register it if the device does not
already have a firmware node, and associate it with the gpio_chip.

Assisted-by: Antigravity:gemini-3.5-flash
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Tested-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

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