[ Merge of http://go/wvgerrit/165617 ]
Similar to the issue with updating secure stops by PST (see
http://go/wvgerrit/165597), when deleting different secure stops with
the same PST results in unintended behavior. This CL changes how the
CDM identifies which secure stop to delete from storaged based on the
key set ID rather than the PST.
Bug: 263316107
Test: device_files_unittest
Test: GTS MediaDrmParameterizedTests and MediaDrmStressTest
Change-Id: Ic3843a1435f252f052c7189423c211c28ed74eaa
2c05c65138