Fix a few warnings.

Templates shouldn't be marked as inline if they aren't defined in the header.

src/core/hw/hw.h

@@ -9,10 +9,10 @@
 namespace HW {
 
 template <typename T>
-inline void Read(T &var, const u32 addr);
+void Read(T &var, const u32 addr);
 
 template <typename T>
-inline void Write(u32 addr, const T data);
+void Write(u32 addr, const T data);
 
 /// Update hardware
 void Update();