Create module for settingslib which don't require platform_apis

The method this change moves needs to be accessed by permission
controller which doesn't have access to platform apis. The new module
SettingsLibUtils requires system api. Other methods in SettingsLib which
don't need platform apis could also be moved into this module.

Test: Use talkback on permission screens
Bug: 127602715
Change-Id: I017fd22712c3e6eb38a0aa1fb95d4331e9b56a2a