post_proc: Fix compilation error for volume listener

Add a dependency on kernel for userspace module libvolumelistener.
The dependency flag ensures volume listener module will build after
kernel modules.

Change-Id: I4dcc97015484e78a2296dbe78f4ef226993d8f90
diff --git a/post_proc/Android.mk b/post_proc/Android.mk
index 0fdd136..e27214b 100644
--- a/post_proc/Android.mk
+++ b/post_proc/Android.mk
@@ -104,10 +104,12 @@
 LOCAL_MODULE:= libvolumelistener
 LOCAL_VENDOR_MODULE := true
 
+LOCAL_ADDITIONAL_DEPENDENCIES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr
+
 LOCAL_C_INCLUDES := \
         hardware/qcom/audio/hal \
         $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include \
-	$(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/techpack/audio/include \
+        $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/techpack/audio/include \
         external/tinyalsa/include \
         $(call include-path-for, audio-effects) \
         $(call include-path-for, audio-route) \