Refactor PermissionManager.SPLIT_PERMISSIONS

Creating a SystemConfig from a non-system process is taking 500+ ms.
This CL instead exposes the needed split permissions from system_server
to optimize performance.

Tested locally and creating PermissionManager / retrieving SystemConfig
is now less than 1 ms.

Bug: 139828734
Bug: 139485700
Fixes: 139828734
Test: Added systrace / logs to PermissionController app and traced
runtime of onGrantDefaultRoles().

Change-Id: I111403e8dae3bc2b0acafc32e61aa5cd890fea29