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/cdm/Android.bp

@@ -8,7 +8,8 @@ METRICS_SRC_DIR = "metrics/src"
 cc_library_static {
     name: "libcdm",
 
-    cflags: ["-DDYNAMIC_ADAPTER"],
+    cflags: ["-DDYNAMIC_ADAPTER",
+             "-DTEST_OEMCRYPTO_V15"],
 
     include_dirs: [
         "vendor/widevine/libwvdrmengine/cdm/core/include",