Give media.metrics service access to uid/pkg info

relax the sepolicy for media.metrics to allow access to
package manager for uid->packagename mapping functionality.

Bug: 65027506
Test: read output of 'dumpsys media.metrics'
Change-Id: I0d25af16c06dc65154cfda854e28ab70ada097c4

public/mediametrics.te

@@ -17,6 +17,9 @@ allow mediametrics proc_meminfo:file r_file_perms;
 # allows interactions with dumpsys to GMScore
 allow mediametrics app_data_file:file write;
 
+# allow access to package manager for uid->apk mapping
+allow mediametrics package_native_service:service_manager find;
+
 ###
 ### neverallow rules
 ###