Stop using SysetmConfig#getSystemPermissions on PermissionMonitor

Repalace the API with SysetmConfigManager#getSystemPermissionUids
and update the design/test accordingly.

Bug: 177188455
Test: atest FrameworksNetTests
Test: atest FrameworksNetIntegrationTests
Test: atest CtsNetTestCases
Change-Id: I8b553b934252b93c60b815715680427a41620054
4 files changed