A number of changes have been upstreamed for am625 since the v2023.01
U-Boot release and we have ported extra support from the vendor kernel
to support operation in Apertis:

- Synced DT files with linux kernel (tag v6.0.3)
- Add support for USB
- Add SPI and SPI flash support
- Enabled Ethernet support
- Switched to upstreamed distroboot support
- Add support for DFU booting
- Clean up the defconfig
- Set USB PID to same value as used by boot ROM
- Increase size of images decompressable with bootm

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>