Get the permission information for native services

For native services such as mediaserver and audioserver, the permission
information cannot be retrieved from getInstalledPackages. Instead, the
high level permission information is avalaible in systemConfigs. With
those permission information, netd can store the complete list of uids
that have UPDATE_DEVICE_STATS permission.

Bug: 128944261
Test: dumpsys netd trafficcontroller
Change-Id: I0331d5a3a5b927a351fcfe6689ef1ba2b993db0c