Add soundtrigger3 HAL (AIDL) to sepolicy

Test: Compile and boot. Don't yet have a HAL implementation to test
      with.
Change-Id: I387abd0e8913eef865cba2aee0a4ef714232bb19
diff --git a/public/hal_audio.te b/public/hal_audio.te
index eb8155b..d1970b9 100644
--- a/public/hal_audio.te
+++ b/public/hal_audio.te
@@ -3,6 +3,7 @@
 binder_call(hal_audio_server, hal_audio_client)
 
 hal_attribute_hwservice(hal_audio, hal_audio_hwservice)
+hal_attribute_service(hal_audio, hal_audio_service)
 
 allow hal_audio ion_device:chr_file r_file_perms;