[ Merge of http://go/wvgerrit/164257 ]
Support for OEMCrypto v15 is being removed from the CDM. The
policy_timers_v15 will no longer be invoked and can be removed.
Bug: 256038127
Test: WV unit/integration tests
Change-Id: Ic3a503ef2a17223dd0bc13696960dcd6822cc343