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.h

@@ -27,6 +27,7 @@ class DeviceFeatures {
   bool cast_receiver;      // Device supports alternate rsa signature padding.
   bool usage_table;        // Device saves usage information.
   bool supports_rsa_3072;  // Device supports 3072 bit RSA keys.
+  bool supports_level_1;   // Device supports Level 1 security.
   uint32_t api_version;
   OEMCrypto_ProvisioningMethod provisioning_method;