Move support buffer update out of the backends (#5411)

* Move support buffer update out of the backends

* Fix render scale init and remove redundant state from SupportBufferUpdater

* Stop passing texture scale to the backends

* XML docs for SupportBufferUpdater

src/Ryujinx.Graphics.Gpu/Shader/ShaderInfoBuilder.cs

@@ -58,6 +58,7 @@ namespace Ryujinx.Graphics.Gpu.Shader
             }
 
             AddDescriptor(SupportBufferStages, ResourceType.UniformBuffer, UniformSetIndex, 0, 1);
+            AddUsage(SupportBufferStages, ResourceType.UniformBuffer, ResourceAccess.Read, UniformSetIndex, 0, 1);
 
             _reservedConstantBuffers = 1; // For the support buffer.