Use license.widevine.com cert for provisioning server

Merge from Widevine repo of http://go/wvgerrit/44505

This CL changes the certificate provisioning code to verify the
provisioning message using a cert from license.widevine.com instead of
the staging certificate.

It also adjusts the certificates in config_test_env.cpp because the
license and provisioning servers are different and may probably have
different certs.

bug: 73031756
test: unit tests with mock oemcrypto, and read oemcrypto on sailfish
Change-Id: I4b457a369a49ef07bda9e5632ab59e5f621ec966

libwvdrmengine/mediadrm/include_hidl/WVDrmPlugin.h

@@ -267,6 +267,7 @@ struct WVDrmPlugin : public IDrmPlugin, IDrmPluginListener,
     virtual void set_device_provisioning_service_certificate(
         const std::string& ) {
       // Ignore. Android does not support service certificates for provisioning
+      // TODO(b/69562876): Android SHOULD support service cert for provisioning
     }
 
     virtual bool is_session_sharing_enabled() const {