[Feature]add MT2731_MP2_MR2_SVN388 baseline version

Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/sound/pci/pcxhr/Makefile b/src/kernel/linux/v4.14/sound/pci/pcxhr/Makefile
new file mode 100644
index 0000000..b06128e
--- /dev/null
+++ b/src/kernel/linux/v4.14/sound/pci/pcxhr/Makefile
@@ -0,0 +1,2 @@
+snd-pcxhr-objs := pcxhr.o pcxhr_hwdep.o pcxhr_mixer.o pcxhr_core.o pcxhr_mix22.o
+obj-$(CONFIG_SND_PCXHR) += snd-pcxhr.o