hal_audio_default: allow audioserver fd for status dump

Test: USB device plug/unplug check for avc: denied
Test: AudioFlinger dumpsys
Bug: 115722843
Change-Id: I0c4186f97a46e41e9f2d75b3f324b6b85399e2b5

vendor/hal_audio_default.te

@@ -6,3 +6,5 @@ init_daemon_domain(hal_audio_default)
 
 hal_client_domain(hal_audio_default, hal_allocator)
 
+# allow audioserver to call hal_audio dump with its own fd to retrieve status
+allow hal_audio_default audioserver:fifo_file write;