Ensure provisioned in unit tests

Merge from Widevine repo of http://go/wvgerrit/61262

This CL helps the CE CDM unit tests provision by providing a helper code to
determine if OEMCrypto is L1 or L3.

Test: unit tests
Test: tested as part of http://go/ag/5501993
Bug: 37286053
Change-Id: Ibe358e0eb628b4051f2db3406eaa6fcfc07f07ff

libwvdrmengine/oemcrypto/test/oec_device_features.cpp

@@ -120,6 +120,11 @@ void DeviceFeatures::Initialize(bool is_cast_receiver,
       printf("TEST_PROVISION_30: Device provisioed with OEM Cert.\n");
       break;
   }
+  std::string security_level = OEMCrypto_SecurityLevel();
+  supports_level_1 = (security_level == "L1");
+  printf("SecurityLevel is %s (%s)",
+         supports_level_1 ? "Level 1" : "Not Level 1",
+         security_level.c_str());
   OEMCrypto_Terminate();
 }