[Feature]add MT2731_MP2_MR2_SVN388 baseline version

Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/meta/meta-mediatek-mt2731/recipes-kernel/linux/files/bt_audio_pcm.cfg b/meta/meta-mediatek-mt2731/recipes-kernel/linux/files/bt_audio_pcm.cfg
new file mode 100644
index 0000000..58a0e5b
--- /dev/null
+++ b/meta/meta-mediatek-mt2731/recipes-kernel/linux/files/bt_audio_pcm.cfg
@@ -0,0 +1 @@
+CONFIG_BT_AUDIO_PCM=y