OEMCrypto v16.2

Merge from Widevine repo of http://go/wvgerrit/93404

This is the unit tests, reference code, and documentation for
OEMCrypto v16.2. Backwards compatibility should work for a v15
OEMCrypto.

Some review comments will be addressed in future CLs.

Bug: 141247171
Test: Unit tests
Test: Media GTS tests on bonito
Change-Id: I9d427c07580e180c0a4cfdc4a68f538d351c0ddd

libwvdrmengine/oemcrypto/odk/src/odk_overflow.h

@@ -5,6 +5,9 @@
 #ifndef WIDEVINE_ODK_SRC_ODK_OVERFLOW_H_
 #define WIDEVINE_ODK_SRC_ODK_OVERFLOW_H_
 
+#include <stddef.h>
+#include <stdint.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif