docs/zh_CN: Add rust arch-support Chinese translation

Translate .../rust/arch-support.rst into Chinese.

Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Alex Shi <alexs@kernel.org>
Reviewed-by: Wu XiangCheng <bobwxc@email.cn>
Link: https://lore.kernel.org/r/1f5b1d1e4f84bf105ab5bed146652937a74e9b69.1666959529.git.siyanteng@loongson.cn


Signed-off-by: Jonathan Corbet <corbet@lwn.net>