Use GTEST_SKIP for non keybox devices

Bug: 251240681
Merged from https://widevine-internal-review.googlesource.com/179090

Change-Id: I8c539bfbccde7f22fb732951a95715935935858f

libwvdrmengine/oemcrypto/test/oemcrypto_provisioning_test.h

@@ -22,6 +22,9 @@ namespace wvoec {
 class OEMCryptoKeyboxTest : public OEMCryptoClientTest {
   void SetUp() override {
     OEMCryptoClientTest::SetUp();
+    if (global_features.provisioning_method != OEMCrypto_Keybox) {
+      GTEST_SKIP() << "Test for Prov 2.0 devices only.";
+    }
     OEMCryptoResult sts = OEMCrypto_IsKeyboxValid();
     // If the production keybox is valid, use it for these tests.  Most of the
     // other tests will use a test keybox anyway, but it's nice to check the