Implement serialization version checking

Merge from Widevine repo of http://go/wvgerrit/125263
and http://go/wvgerrit/135749

Define a |major.minor| version in the
serialization layer and check for compatibility
between REE and TEE before accepting connections.

bug: 158857733
test: opk_all_tests
Change-Id: Iad44a1f50a27c6bca4959c6d41c9b361712dbde8

libwvdrmengine/cdm/core/test/test_printers.cpp

@@ -1213,6 +1213,13 @@ void PrintTo(const enum OEMCryptoResult& value, ::std::ostream* os) {
     case ODK_STALE_RENEWAL:
       *os << "STALE_RENEWAL";
       break;
+    // OPK Values.
+    case OPK_ERROR_INCOMPATIBLE_VERSION:
+      *os << "INCOMPATIBLE_VERSION";
+      break;
+    case OPK_ERROR_REMOTE_CALL:
+      *os << "REMOTE_CALL";
+      break;
   }
 }
 namespace okp {