docs/zh_CN add PCI index.rst translation

Translate ../PCI/index.rst into Chinese
Signed-off-by: NYanteng Si <siyanteng@loongson.cn>
Reviewed-by: NAlex Shi <alexs@kernel.org>
Link: https://lore.kernel.org/r/668466823fd2b66768553f12199bce74e8450f78.1635248253.git.siyanteng@loongson.cnSigned-off-by: NJonathan Corbet <corbet@lwn.net>

Documentation/translations/zh_CN/PCI/index.rst

+.. SPDX-License-Identifier: GPL-2.0
+.. include:: ../disclaimer-zh_CN.rst
+
+:Original: Documentation/PCI/index.rst
+
+:翻译:
+
+ 司延腾 Yanteng Si <siyanteng@loongson.cn>
+
+:校译:
+
+
+
+.. _cn_PCI_index.rst:
+
+===================
+Linux PCI总线子系统
+===================
+
+.. toctree::
+   :maxdepth: 2
+   :numbered:
+
+Todolist:
+
+   pci
+   pciebus-howto
+   pci-iov-howto
+   msi-howto
+   sysfs-pci
+   acpi-info
+   pci-error-recovery
+   pcieaer-howto
+   endpoint/index
+   boot-interrupts