Temp updates to enable MSAA rendering w/o errors

Temp MSAA RTs cannot have UAVs generated (enableRandomWrite)
The depth textures need bindMS = true, otherwise, CopyTexture and related ops fail

Now, the light list gen needs to be fixed, and then we can start making progress!

ScriptableRenderPipeline/Core/CoreRP/CoreUtils.cs

             baseDesc.sRGB = (readWrite != RenderTextureReadWrite.Linear);
             // TODO: Explicit MSAA support will come in later
 
+            if ((format == RenderTextureFormat.Depth) && baseDesc.msaaSamples > 1)
+                baseDesc.bindMS = true;
+
             return new RenderTexture(baseDesc);
         }
 
             baseDesc.colorFormat = format;
             baseDesc.sRGB = (readWrite != RenderTextureReadWrite.Linear);
             baseDesc.msaaSamples = msaaSamples;
+            if (msaaSamples > 1)
+                enableRandomWrite = false;
             baseDesc.enableRandomWrite = enableRandomWrite;
         }
 

ScriptableRenderPipeline/HDRenderPipeline/HDRP/HDRenderPipeline.cs

         bool m_FullScreenDebugPushed;
 
         // temp hack
-        public const int kMsaaSamplesFixed = 2;
+        public const int kMsaaSamplesFixed = 1;
 
         public HDRenderPipeline(HDRenderPipelineAsset asset)
         {

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Lighting/LightLoop/LightLoop.cs

         static int s_GenListPerBigTileKernel;
 
         const bool k_UseDepthBuffer = true;      // only has an impact when EnableClustered is true (requires a depth-prepass)
+        //const bool k_UseDepthBuffer = false;      // only has an impact when EnableClustered is true (requires a depth-prepass)
 
         const int k_Log2NumClusters = 6;     // accepted range is from 0 to 6. NumClusters is 1<<g_iLog2NumClusters
         const float k_ClustLogBase = 1.02f;     // each slice 2% bigger than the previous