Merge from widevine repo of http://go/wvgerrit/22382
This updates the key control verification string in the haystack, in
the reference oemcrypto (mock), and in the oemcrypto unit tests.
The unit tests now set the key control block to be kc12 for all
licenses if the API is set to version 12. Previously, we only used
the more recent verification codes if the key control block used
recent features.
This should help prevent future incidents like b/32830469.
Change-Id: I6c215b4058445a6d807610af94457598f26d591a
7fc037f1a9