VideoSW: Use more VideoCommon

Now we require lots of empty functions, but this removes by far more duplicated code.

Source/Core/VideoBackends/Software/TextureEncoder.cpp

@@ -2,10 +2,10 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
-#include "VideoBackends/Software/BPMemLoader.h"
 #include "VideoBackends/Software/EfbInterface.h"
 #include "VideoBackends/Software/TextureEncoder.h"
 
+#include "VideoCommon/BPMemory.h"
 #include "VideoCommon/LookUpTables.h"
 #include "VideoCommon/TextureDecoder.h"