[D3D12] Remove unneeded code things from pools

src/xenia/ui/d3d12/d3d12_descriptor_heap_pool.cc

@@ -11,7 +11,6 @@
 
 #include "xenia/base/assert.h"
 #include "xenia/base/logging.h"
-#include "xenia/ui/d3d12/d3d12_util.h"
 
 namespace xe {
 namespace ui {

src/xenia/ui/d3d12/d3d12_upload_buffer_pool.h

@@ -17,9 +17,6 @@ namespace xe {
 namespace ui {
 namespace d3d12 {
 
-// Submission index is the fence value or a value derived from it (if reclaiming
-// less often than once per fence value, for instance).
-
 class D3D12UploadBufferPool : public GraphicsUploadBufferPool {
  public:
   D3D12UploadBufferPool(D3D12Provider& provider,