Defer Sysman Engine Module Initialization

With this change, init for sysman Engine API would not be done during zeInit.
init and thereby Engine API handle creation would be done only
when user explicitly requests to enumerate handles
using zesDeviceEnumEngineGroups

Related-To: LOCI-3127

Signed-off-by: Kulkarni, Ashwin Kumar <ashwin.kumar.kulkarni@intel.com>

level_zero/tools/source/sysman/ras/ras.cpp

@@ -41,6 +41,7 @@ ze_result_t RasHandleContext::rasGet(uint32_t *pCount,
                                      zes_ras_handle_t *phRas) {
     std::call_once(initRasOnce, [this]() {
         this->init(pOsSysman->getDeviceHandles());
+        this->rasInitDone = true;
     });
     uint32_t handleListSize = static_cast<uint32_t>(handleList.size());
     uint32_t numToCopy = std::min(*pCount, handleListSize);

level_zero/tools/source/sysman/ras/ras.h

@@ -46,10 +46,14 @@ struct RasHandleContext {
 
     OsSysman *pOsSysman = nullptr;
     std::vector<Ras *> handleList = {};
+    bool isRasInitDone() {
+        return rasInitDone;
+    }
 
   private:
     void createHandle(zes_ras_error_type_t type, ze_device_handle_t deviceHandle);
     std::once_flag initRasOnce;
+    bool rasInitDone = false;
 };
 
 } // namespace L0