audio: Use project pathmap

Change-Id: I908f080105aad8ff686e409fd04ff730f09a86a4
diff --git a/post_proc/Android.mk b/post_proc/Android.mk
index f1174a0..11d7461 100644
--- a/post_proc/Android.mk
+++ b/post_proc/Android.mk
@@ -59,7 +59,7 @@
 LOCAL_PROPRIETARY_MODULE := true
 
 LOCAL_C_INCLUDES := \
-        hardware/qcom/audio/hal \
+	$(call project-path-for,qcom-audio)/hal \
 	$(call include-path-for, audio-effects)
 
 LOCAL_HEADER_LIBRARIES += libhardware_headers