refactor: determine hp copy engine once after gfx core helper is created

- do not determine engine on every call to getDefaultHpCopyEngine()

Signed-off-by: Mateusz Hoppe <mateusz.hoppe@intel.com>

shared/source/execution_environment/root_device_environment.cpp

@@ -166,6 +166,7 @@ void RootDeviceEnvironment::initHelpers() {
 void RootDeviceEnvironment::initGfxCoreHelper() {
     if (gfxCoreHelper == nullptr) {
         gfxCoreHelper = GfxCoreHelper::create(this->getHardwareInfo()->platform.eRenderCoreFamily);
+        gfxCoreHelper->initializeDefaultHpCopyEngine(*this->getHardwareInfo());
     }
 }