Fix 16-byte alignment issues

Assets/ScriptableRenderPipeline/HDRenderPipeline/Lighting/TilePass/TilePass.cs

                 public uint    envLightCount;
                 public uint    numTileFtplX;
                 public uint    numTileFtplY;
+                public uint    pad0, pad1; // 16-byte alignment
                 // public uint    numTileClusteredX;
                 // public uint    numTileClusteredY;
                 // public uint    isLogBaseBufferEnabled;

Assets/ScriptableRenderPipeline/HDRenderPipeline/Lighting/TilePass/TilePass.hlsl

     uint   envLightCount;
     uint   numTileFtplX;
     uint   numTileFtplY;
+    uint   pad0, pad1; // 16-byte alignment
     // uint   numTileClusteredX;
     // uint   numTileClusteredY;
     // uint   isLogBaseBufferEnabled;