[GPU/WGF] Bind EDRAM to resolve dumping via ByteAddressBuffer

Simplifies binding by eliminating the need to switch between 32-bit and
64-bit views, and makes it possible to bind the EDRAM via a root descriptor
on Direct3D 12.

src/xenia/gpu/d3d12/d3d12_render_target_cache.h

@@ -611,7 +611,7 @@ class D3D12RenderTargetCache final : public RenderTargetCache {
 
     // May be different for different sources.
     kDumpRootParameterColorPitches = kDumpRootParameterSource + 1,
-    // Only changed between 32bpp and 64bpp.
+    // Not changed.
     kDumpRootParameterColorEdram,
 
     kDumpRootParameterColorCount,