QMAA: Add support for HAL module disable

- Disable audio HAL modules compilation
  based on QMAA flag

Change-Id: I3ec8c82bfcf699a3bbf5e7133480a4bda1240a5a
diff --git a/voice_processing/Android.mk b/voice_processing/Android.mk
index 5b865b7..820684a 100644
--- a/voice_processing/Android.mk
+++ b/voice_processing/Android.mk
@@ -1,3 +1,4 @@
+ifneq ($(AUDIO_USE_STUB_HAL), true)
 LOCAL_PATH:= $(call my-dir)
 
 # audio preprocessing wrapper
@@ -43,3 +44,4 @@
 LOCAL_CFLAGS += -Wno-unused-local-typedef
 
 include $(BUILD_SHARED_LIBRARY)
+endif