Clean up some test docs

Some tests were not in a doxygen group, so they were not
showing up on the dev site.

Bug: 298719677
Change-Id: Ic86b7999ac7ab324eb40a30023b74897f87d97e5

libwvdrmengine/oemcrypto/test/oemcrypto_cast_test.cpp

@@ -11,6 +11,9 @@ using ::testing::Range;
 
 namespace wvoec {
 
+/// @addtogroup generic
+/// @{
+
 /** If a device can load a private key with the alternate padding schemes, it
  * should support signing with the alternate scheme. */
 TEST_F(OEMCryptoLoadsCertificateAlternates, TestSignaturePKCS1) {
@@ -1019,4 +1022,5 @@ TEST_P(OEMCryptoSessionTestLoadCasKeysWithHDCP, CasOnlyLoadCasKeysAPI17) {
 }
 INSTANTIATE_TEST_SUITE_P(TestHDCP, OEMCryptoSessionTestLoadCasKeysWithHDCP,
                          Range(1, 6));
+/// @}
 }  // namespace wvoec