Label persist audio properties

label all persist.audio.* properties
and allow mediaserver access to them.

Change-Id: If5755d9783dce298e66a25bcb7f17ff17bd83ea7

mediaserver.te

@@ -3,6 +3,7 @@ type mediaserver, domain;
 type mediaserver_exec, exec_type, file_type;
 
 init_daemon_domain(mediaserver)
+unix_socket_connect(mediaserver, property, init)
 net_domain(mediaserver)
 typeattribute mediaserver mlstrustedsubject;
 allow mediaserver kernel:system module_request;
@@ -43,3 +44,4 @@ allow mediaserver qtaguid_device:chr_file r_file_perms;
 allow mediaserver rild:unix_stream_socket connectto;
 
 allow mediaserver tee_device:chr_file rw_file_perms;
+allow mediaserver audio_prop:property_service set;

property.te

@@ -7,3 +7,4 @@ type rild_prop, property_type;
 type ctl_default_prop, property_type;
 type ctl_dumpstate_prop, property_type;
 type ctl_rildaemon_prop, property_type;
+type audio_prop, property_type;

property_contexts

@@ -29,6 +29,7 @@ log.                    u:object_r:shell_prop:s0
 service.adb.root        u:object_r:shell_prop:s0
 service.adb.tcp.port    u:object_r:shell_prop:s0
 
+persist.audio.          u:object_r:audio_prop:s0
 persist.sys.            u:object_r:system_prop:s0
 persist.service.        u:object_r:system_prop:s0
 persist.security.       u:object_r:system_prop:s0