ATOM-16237 Using setting registry to RPI system settings (#3663)

* ATOM-16237 Using setting registry to RPI system settings
Changes include:
- Remove RHISystemDesriptor since the pre-registered draw list tag is not needed.
- Remove EitorContext which was for system component settings.
- Add atom_rpi.setreg file
- Add getting RPISystemDescriptor from setting registry.

Signed-off-by: qingtao <qingtao@amazon.com>

Gems/Atom/RPI/Code/Source/RPI.Private/RPISystemComponent.cpp

@@ -15,9 +15,11 @@
 
 #include <Atom/RHI/Factory.h>
 
+#include <AzCore/Asset/AssetManager.h>
 #include <AzCore/IO/IOUtils.h>
 #include <AzCore/Serialization/SerializeContext.h>
-#include <AzCore/Asset/AssetManager.h>
+#include <AzCore/Settings/SettingsRegistry.h>
+
 #ifdef RPI_EDITOR
 #include <Atom/RPI.Edit/Material/MaterialFunctorSourceDataRegistration.h>
 #endif
@@ -84,8 +86,11 @@ namespace AZ
 
         void RPISystemComponent::Activate()
         {
-            // [GFX TODO] [ATOM-1436] this can be removed when setup and save system component's configure from projectConfigure.exe is fixed.
-            m_rpiDescriptor.m_rhiSystemDescriptor.m_drawListTags.push_back(AZ::Name("forward"));
+            auto settingsRegistry = AZ::SettingsRegistry::Get();
+            if (settingsRegistry)
+            {
+                settingsRegistry->GetObject(m_rpiDescriptor, "/O3DE/Atom/RPI/Initialization");
+            }
 
             m_rpiSystem.Initialize(m_rpiDescriptor);
             AZ::SystemTickBus::Handler::BusConnect();