barebox: upgrade 2025.08.0 -> 2025.09.0

barebox: upgrade 2025.08.0 -> 2025.09.0

Changes in 2025.09.0
--------------------

* Added support for SoCFPGA Agilex5 and Rockchip RK3576
* Added structured I/O support for shell commands
* Added support for booting signed Rockchip images
* Support for adding device tree overlay (.dtbo) files to FIT images
* New 'bfetch' eyecandy tool for displaying logo and system information
  (similar to 'neofetch')
* Several other fixes and improvements

Changelog: https://lore.barebox.org/barebox/aNugWfoJR_2AirEx@pengutronix.de/

Migration Guide:
https://barebox.org/doc/latest/migration-guides/migration-2025.09.0.html

Signed-off-by: Enrico Jörns <ejo@pengutronix.de>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>