[ Merge of http://go/wvgerrit/22980 ]
System Renewability Messages (SRM) contains a list of Key Selection
Vectors, which are HDCP Identifiers that have been revoked.
During HDCP negotiations a transmitter may authenticate a receiver
and verify that its unique identier is not present in the SRM.
This CL enables reporting of the current SRM version and whether SRM
updates are supported. It also loads SRM updates in the license
and specifies SRM version requirements when keys are loaded.
Test: All unittests other than some oemcrypto, request_license_test
passed. Those tests failed with or without this CL.
b/28955520
Change-Id: Id840078ea2deb01d9619c1cd8d367b50452f76cc