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/RHI/Code/Source/RHI.Reflect/ReflectSystemComponent.cpp

@@ -27,7 +27,6 @@
 #include <Atom/RHI.Reflect/ReflectSystemComponent.h>
 #include <Atom/RHI.Reflect/RenderAttachmentLayout.h>
 #include <Atom/RHI.Reflect/ResolveScopeAttachmentDescriptor.h>
-#include <Atom/RHI.Reflect/RHISystemDescriptor.h>
 #include <Atom/RHI.Reflect/Scissor.h>
 #include <Atom/RHI.Reflect/ScopeAttachmentDescriptor.h>
 #include <Atom/RHI.Reflect/ShaderDataMappings.h>
@@ -161,7 +160,6 @@ namespace AZ
             TransientAttachmentPoolBudgets::Reflect(context);
             PlatformLimits::Reflect(context);
             PlatformLimitsDescriptor::Reflect(context);
-            RHISystemDescriptor::Reflect(context);
             Origin::Reflect(context);
             ReflectVendorIdEnums(context);
             PhysicalDeviceDriverValidator::Reflect(context);