MAINTAINERS: add maillist information for LoongArch

Now there is a dedicated maillist ([email protected]) for
LoongArch, add it for better collaboration.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Huacai Chen <[email protected]>
Reviewed-by: WANG Xuerui <[email protected]>
Cc: Huacai Chen <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Xuefeng Li <[email protected]>
Cc: Guo Ren <[email protected]>
Cc: Xuerui Wang <[email protected]>
Cc: Jiaxun Yang <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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