xunlong-orangepi5-plus: new device

This MR adds support for the Orange Pi 5 Plus, as well as a kernel package that can be used for other RK3588/RK3588S boards.

TODO:

• Test on stock u-boot (I have UEFI installed on my board currently)
• Create Wiki page
• Try to fix audio
• Test booting from different storage mediums (SD, USB)