Unit Test Updates for v13

Merge from widevine of http://go/wvgerrit/23042

This updates unit tests to account for key control block changes for
OEMCrypto v13.  There are two new bits, restricting SRM version and
restricting analog output.  The verification string is also updated.

Part of this is to include some simple unit tests for the SRM
functions.

b/33815454
b/28955520

Change-Id: I7cc2ce508688fded2b67fc2a4379c7a8d59d8d22

libwvdrmengine/oemcrypto/mock/src/oemcrypto_engine_mock.h

@@ -212,7 +212,8 @@ class SessionContext {
   OEMCryptoResult DecryptCTR(const uint8_t* key_u8, const uint8_t* iv,
                              size_t block_offset, const uint8_t* cipher_data,
                              size_t cipher_data_length, uint8_t* clear_data);
-
+  OEMCryptoResult AllowKeyUse(const std::string& log_string, uint32_t use_type,
+                              OEMCryptoBufferType buffer_type);
   RSA* rsa_key() { return rsa_key_.get(); }
 
   bool valid_;