Add a namespace to DSPHost.

Gets rid of the "DSPHost_" prefix in function names.

Source/Core/Core/DSP/DSPHost.h

@@ -9,11 +9,14 @@
 // core isn't used, for example in an asm/disasm tool, then most of these
 // can be stubbed out.
 
-u8 DSPHost_ReadHostMemory(u32 addr);
-void DSPHost_WriteHostMemory(u8 value, u32 addr);
-void DSPHost_OSD_AddMessage(const std::string& str, u32 ms);
-bool DSPHost_OnThread();
-bool DSPHost_Wii();
-void DSPHost_InterruptRequest();
-void DSPHost_CodeLoaded(const u8 *ptr, int size);
-void DSPHost_UpdateDebugger();
+namespace DSPHost
+{
+u8 ReadHostMemory(u32 addr);
+void WriteHostMemory(u8 value, u32 addr);
+void OSD_AddMessage(const std::string& str, u32 ms);
+bool OnThread();
+bool IsWiiHost();
+void InterruptRequest();
+void CodeLoaded(const u8 *ptr, int size);
+void UpdateDebugger();
+}