st-hal-ar: Add dependency on libarpal_headers

Change-Id: I54c1b48574934c5b07c3913b13cbcae63359bb7f
diff --git a/Android.mk b/Android.mk
index 88f1f42..79343f7 100644
--- a/Android.mk
+++ b/Android.mk
@@ -31,6 +31,7 @@
     SoundTriggerSession.cpp
 
 LOCAL_HEADER_LIBRARIES := \
+    libarpal_headers \
     libhardware_headers \
     libsystem_headers