CPU: Convert CCPU into a namespace

There's not much point to a class with only static member functions.

Source/Core/Core/PowerPC/Interpreter/Interpreter.cpp

@@ -244,7 +244,7 @@ void Interpreter::Run()
 							}
 						#endif
 						INFO_LOG(POWERPC, "Hit Breakpoint - %08x", PC);
-						CCPU::Break();
+						CPU::Break();
 						if (PowerPC::breakpoints.IsTempBreakPoint(PC))
 							PowerPC::breakpoints.Remove(PC);