[Feature]add MT2731_MP2_MR2_SVN388 baseline version

Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/sound/oss/msnd_classic.c b/src/kernel/linux/v4.14/sound/oss/msnd_classic.c
new file mode 100644
index 0000000..3b23a09
--- /dev/null
+++ b/src/kernel/linux/v4.14/sound/oss/msnd_classic.c
@@ -0,0 +1,3 @@
+/* The work is in msnd_pinnacle.c, just define MSND_CLASSIC before it. */
+#define MSND_CLASSIC
+#include "msnd_pinnacle.c"