Refactor oemcrypto mock into stand alone reference code

Merge from Widevine repo of http://go/wvgerrit/46204
Refactor utility code - split the mock, step 1

Merge from Widevine repo of http://go/wvgerrit/46205
Move some OEMCrypto types to common header - split the mock, step 2

Merge from Widevine repo of http://go/wvgerrit/46206
Split mock into two -- step 3

Merge from Widevine repo of http://go/wvgerrit/47460
Split the mock into two -- step 3.5

The CL moves several files used by oemcrypto and cdm into a common
subdirectory, so that it may more easily be shared with partners.

The CORE_DISALLOW_COPY_AND_ASSIGN macro was moved to its own header in
the util/include directory.

This CL removes some references to the mock from other code, and puts
some constants and types, such as the definition of the keybox, into a
header in oemcrypto.

Test: tested as part of http://go/ag/4674759
bug: 76393338
Change-Id: I75b4bde7062ed8ee572c97ebc2f4da018f4be0c9

libwvdrmengine/oemcrypto/test/oemcrypto_session_tests_helper.h

@@ -26,7 +26,7 @@ public:
   // If force is true, we assert that the key loads successfully.
   void CreateWrappedRSAKey(uint32_t allowed_schemes, bool force);
 
-  void InstallKeybox(const wvoec_mock::WidevineKeybox& keybox, bool good);
+  void InstallKeybox(const wvoec::WidevineKeybox& keybox, bool good);
 
   void EnsureTestKeys();
 
@@ -34,7 +34,7 @@ public:
 
   std::vector<uint8_t> encoded_rsa_key_;
   std::vector<uint8_t> wrapped_rsa_key_;
-  wvoec_mock::WidevineKeybox keybox_;
+  wvoec::WidevineKeybox keybox_;
 };
 
 }  // namespace wvoec