Allowing hal_audio to search audio_data_file dirs

Following denial occurs on boot:
denied { search } for comm="audio@2.0-servi" name="audio" dev="sda35"
ino=5242949 scontext=u:r:hal_audio_default:s0
tcontext=u:object_r:audio_data_file:s0 tclass=dir

Test: hal_audio can search audio_data_file directories without
generating selinux denials

Change-Id: I7fe613ae784d810e3d3608374a524d0bc6faab63
diff --git a/sepolicy/hal_audio.te b/sepolicy/hal_audio.te
index 28fd756..42fe18c 100644
--- a/sepolicy/hal_audio.te
+++ b/sepolicy/hal_audio.te
@@ -5,6 +5,8 @@
 allow hal_audio audio_cal_device:chr_file rw_file_perms;
 r_dir_file(hal_audio, sysfs_soc)
 
+allow hal_audio audio_data_file:dir search;
+
 userdebug_or_eng(`
   allow hal_audio diag_device:chr_file rw_file_perms;
 ')