Use GTEST_SKIP for session tests

Bug: 251240681
Merged from https://widevine-internal-review.googlesource.com/180010

Change-Id: I39e5c0365a5e0c2ddf62e6f68426f6baa3ddd1a1

libwvdrmengine/oemcrypto/test/oemcrypto_decrypt_test.h

@@ -98,6 +98,10 @@ class OEMCryptoSessionTestsDecryptTests
  protected:
   void SetUp() override {
     OEMCryptoLicenseTestAPI16::SetUp();
+    if (wvoec::global_features.derive_key_method ==
+        wvoec::DeviceFeatures::NO_METHOD) {
+      GTEST_SKIP() << "Test for devices that can derive session keys only.";
+    }
     pattern_ = ::testing::get<0>(GetParam());
     cipher_mode_ = ::testing::get<1>(GetParam());
     decrypt_inplace_ = ::testing::get<2>(GetParam()).decrypt_inplace;