VertexLoader_Position: Tidy up public function definitions

We can use u32 instead of unsigned int to shorten up these definitions
and make them much nicer to read.

While we're at it, change the size array to house u32 elements to match
the return value of the function.

Source/Core/VideoCommon/VertexLoader_Position.h

@@ -10,9 +10,7 @@
 class VertexLoader_Position
 {
 public:
-  // GetSize
-  static unsigned int GetSize(u64 _type, unsigned int _format, unsigned int _elements);
+  static u32 GetSize(u64 type, u32 format, u32 elements);
 
-  // GetFunction
-  static TPipelineFunction GetFunction(u64 _type, unsigned int _format, unsigned int _elements);
+  static TPipelineFunction GetFunction(u64 type, u32 format, u32 elements);
 };