[HDMI Audio] Fix SEPolicy issue that prevent HDMI audio functionality.

Error:
avc:  denied  { search } for  comm="binder:845_2" name="hdmi_audio" dev="sysfs" ino=77907 scontext=u:r:hal_audio_default:s0 tcontext=u:object_r:sysfs_extcon:s0 tclass=dir permissive=0

Test: Local test.
Bug: 327710671
Change-Id: I413f4edae98cb0b868a4b6b7c62f6d4ae6f17727
diff --git a/audio/sepolicy/common/hal_audio_default.te b/audio/sepolicy/common/hal_audio_default.te
index bfe72b1..fac4f1a 100644
--- a/audio/sepolicy/common/hal_audio_default.te
+++ b/audio/sepolicy/common/hal_audio_default.te
@@ -12,6 +12,8 @@
 allow hal_audio_default amcs_device:file rw_file_perms;
 allow hal_audio_default amcs_device:chr_file rw_file_perms;
 allow hal_audio_default sysfs_pixelstats:file rw_file_perms;
+allow hal_audio_default sysfs_extcon:dir search;
+allow hal_audio_default sysfs_extcon:file r_file_perms;
 
 #allow access to aoc and kernel boottime
 allow hal_audio_default sysfs_aoc:dir { search };