De-tile GOB when DMA copying from block linear to pitch kind memory regions (#3207)

* De-tile GOB when DMA copying from block linear to pitch kind memory regions

* XML docs + nits

* Remove using

* No flush for regular buffer copies

* Add back ulong casts, fix regression due to oversight

Ryujinx.Graphics.Nvdec/Image/SurfaceReader.cs

@@ -16,7 +16,7 @@ namespace Ryujinx.Graphics.Nvdec.Image
             int width = surface.Width;
             int height = surface.Height;
             int stride = surface.Stride;
- 
+
             ReadOnlySpan<byte> luma = gmm.DeviceGetSpan(lumaOffset, GetBlockLinearSize(width, height, 1));
 
             ReadLuma(surface.YPlane.AsSpan(), luma, stride, width, height);