[Feature]add MT2731_MP2_MR2_SVN388 baseline version

Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/Documentation/sound/kernel-api/index.rst b/src/kernel/linux/v4.14/Documentation/sound/kernel-api/index.rst
new file mode 100644
index 0000000..d0e6df3
--- /dev/null
+++ b/src/kernel/linux/v4.14/Documentation/sound/kernel-api/index.rst
@@ -0,0 +1,8 @@
+ALSA Kernel API Documentation
+=============================
+
+.. toctree::
+   :maxdepth: 2
+
+   alsa-driver-api
+   writing-an-alsa-driver