xiaomi-nabu: new device

This adds Xiaomi Pad 5, it uses a close to mainline kernel on 6.12.0 the firmware is packaged and supported, although hexagonrpcd is not working yet this is a continuation from https://github.com/map220v/postmarket_xiaomi_nabu/tree/test updating its config and updating its components i based the hexagonrpcd bringup from xiaomi-elish and google-sargo

CPU, GPU, Touchscreen, audio, pen, wifi, bluetooth, pogopin keyboard, suspend, are tested and working UFS is still presenting issues so we are using a workaround to be able to boot properly (cmdline)