config: enable AHAL extension feature

Enable AHAL extension feature.

Change-Id: I2e99584a93cf316ad8745fc4b7784cf8faaef024
diff --git a/configs/msmnile/msmnile.mk b/configs/msmnile/msmnile.mk
index 5544d1f..10fa876 100644
--- a/configs/msmnile/msmnile.mk
+++ b/configs/msmnile/msmnile.mk
@@ -40,6 +40,7 @@
 AUDIO_FEATURE_ENABLED_USB_TUNNEL := true
 AUDIO_FEATURE_ENABLED_A2DP_OFFLOAD := true
 AUDIO_FEATURE_ENABLED_3D_AUDIO := true
+AUDIO_FEATURE_ENABLED_AHAL_EXT := true
 DOLBY_ENABLE := false
 endif