Add loongarch64 generic and QEMU device packages
The QEMU device can be booted with pmb 3.6.0, the generic device can be used on any Loongson machine with UEFI, which practically means all desktop, mini-PC and server machines sold until now.
The QEMU device can be booted with pmb 3.6.0, the generic device can be used on any Loongson machine with UEFI, which practically means all desktop, mini-PC and server machines sold until now.