QMAA: Add support for HAL module disable

- Disable audio HAL modules compilation
  based on QMAA flag

Change-Id: I3ec8c82bfcf699a3bbf5e7133480a4bda1240a5a
diff --git a/post_proc/Android.mk b/post_proc/Android.mk
index 43132eb..1d0c0ea 100644
--- a/post_proc/Android.mk
+++ b/post_proc/Android.mk
@@ -1,4 +1,4 @@
-
+ifneq ($(AUDIO_USE_STUB_HAL), true)
 LOCAL_PATH:= $(call my-dir)
 
 include $(CLEAR_VARS)
@@ -203,3 +203,4 @@
 include $(BUILD_SHARED_LIBRARY)
 
 endif
+endif