feat: Add LoongArch support and update config.*

[specialpointcentral]

LoongArch is a new architecture which is similar to the RISC-V. Add the config information at config.guess and config.sub to support it.

Also, same as commit 6f60cf1, config.guess and config.sub is synced with the upstream.

Signed-off-by: SPC [email protected]