OEMCrypto v14 Unit tests and reference code

Merge from Widevine repo of http://go/wvgerrit/41661

bug: 64001862 OEMCrypto V14 for Android P

test: Unit tests pass
Change-Id: I3314a881357c12ef63d7b257d83f6f0d07e4725a

libwvdrmengine/oemcrypto/test/oemcrypto_test_android.cpp

@@ -138,4 +138,12 @@ TEST_F(OEMCryptoAndroidOCTest, MinVersionNumber13) {
   ASSERT_GE(version, 13u);
 }
 
+// These tests are required for Pi Android devices.
+class OEMCryptoAndroidPiTest : public OEMCryptoAndroidOCTest {};
+
+TEST_F(OEMCryptoAndroidPiTest, MinVersionNumber14) {
+  uint32_t version = OEMCrypto_APIVersion();
+  ASSERT_GE(version, 14u);
+}
+
 }  // namespace wvoec