docs/zh_CN: add virt paravirt_ops translation

Translate Documentation/virt/paravirt_ops.rst into Chinese.

Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Reviewed-by: Alex Shi <alexs@kernel.org>
Link: https://lore.kernel.org/r/abba361233e2a58999ef5d31c20f24370d7724f2.1628212777.git.siyanteng@loongson.cn


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