Handle update-ownership tag

For update ownership enforcement, using the config to enable the
enforcement for the system apps.

A config is expected to have "update-ownership" tags per package:
```
<config>
    <update-ownership package="foo" installer="bar" />
</config>
```

Bug: 244413073
Test: atest FrameworksServicesTests:SystemConfigTest
Change-Id: I38e996eb885a130f72f656b27731d9f31b16b366