[Feature]add MT2731_MP2_MR2_SVN388 baseline version

Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/sound/spi/Makefile b/src/kernel/linux/v4.14/sound/spi/Makefile
new file mode 100644
index 0000000..a383491
--- /dev/null
+++ b/src/kernel/linux/v4.14/sound/spi/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
+# Makefile for SPI drivers
+
+snd-at73c213-objs		:= at73c213.o
+
+obj-$(CONFIG_SND_AT73C213)	+= snd-at73c213.o