Report binderized vendor service name

Update the vts vendor module to
return the service name instead of the
default passthrough service name to
support binderized mode.

Part of VTS test suite validation for
the binderized Widevine service

Test: drm vts test

Change-Id: I04c9fa6f66af43db6c405ecc8d714b712d87a45a
related-to-bug:34178477

libwvdrmengine/vts/vendor_module/vts_module.h

@@ -32,8 +32,7 @@ namespace widevine_vts {
         virtual std::vector<ContentConfiguration>
                 getContentConfigurations() const;
 
-        // TODO: change to "widevine" when HAL service is available
-        virtual std::string getServiceName() const {return "default";}
+        virtual std::string getServiceName() const {return "widevine";}
 
     private:
         WidevineVTSVendorModule_V1(const WidevineVTSVendorModule_V1&) = delete;