The MIPS64r6el Port of AOSC is upstreamed

This port is currently supported by AOSC upstream:

https://aosc.io/zh-cn/
https://github.com/AOSC-Dev/
https://releases.aosc.io/os-mips64r6el/base/
https://releases.aosc.io/os-mips64r6el/base/rawimg/