Add get last entitlement value callback API

The callback would be used to notify entitlement value. If the
cache value indicates entitlement succeeded, it just fire
callback with cache value instead of run entitlement check.

Bug: 120887283
Test: atest FrameworksNetTests
Change-Id: I8afe928423bd75c54c61533a50a5c0814922ceb1
8 files changed