[ Merge of http://go/wvgerrit/158877 ]
The UsageTableHeader's LRU algorithm for determining which entry to
evict when full uses special considerations based on the type of
entry (offline or secure stop).
This CL removes all secure-stop-specific considerations, and instead
treats secure stop's the same as an unused entry. Secure stop entries
will always be selected for removal before offline licenses (expired
or not).
Additionally, LRU table upgrading will ignore secure-stop entries.
This has no effect in practice as DeviceFiles will not load secure
stop usage entries when UsageTableHeader is initialized on a real
file system.
Bug: 242289743
Test: run_x86_64_tests and request_license_test
Change-Id: Ib3f71f191aed94aad62951667426911e4e202068
7a34c1748c