Allow mediaserver to access vendor apps

Currently, when vendor app use MediaPlayer to play its audio resource,
would failed due to this neverallow rules.

Bug: 78436043
Change-Id: Id910184c16955f9e4e4c8d3bb6eca2253ab59063

public/domain.te

@@ -955,6 +955,7 @@ full_treble_only(`
         userdebug_or_eng(`-perfprofd')
         -postinstall_dexopt
         -system_server
+        -mediaserver
     } vendor_app_file:file r_file_perms;
 ')
 

public/mediaserver.te

@@ -99,6 +99,9 @@ allow mediaserver hidl_token_hwservice:hwservice_manager find;
 allow mediaserver oemfs:dir search;
 allow mediaserver oemfs:file r_file_perms;
 
+# /vendor apk access
+allow mediaserver vendor_app_file:file r_file_perms;
+
 use_drmservice(mediaserver)
 allow mediaserver drmserver:drmservice {
     consumeRights