[Feature]add MT2731_MP2_MR2_SVN388 baseline version

Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/Documentation/sound/oss/OPL3 b/src/kernel/linux/v4.14/Documentation/sound/oss/OPL3
new file mode 100644
index 0000000..2468ff8
--- /dev/null
+++ b/src/kernel/linux/v4.14/Documentation/sound/oss/OPL3
@@ -0,0 +1,6 @@
+A pure OPL3 card is nice and easy to configure. Simply do
+
+insmod opl3 io=0x388
+
+Change the I/O address in the very unlikely case this card is differently
+configured