hle: Add proper type for result code

This should clean up all HLE errorcode in the codebase.

I didn't removed Rust::Result as this should be a cleanup for another
iteration.

src/core/services/ptm.cpp

@@ -3,18 +3,12 @@
 
 namespace PTMCommands {
 	enum : u32 {
-		GetStepHistory = 0x000B00C2, 
+		GetStepHistory = 0x000B00C2,
 		GetTotalStepCount = 0x000C0000,
 		ConfigureNew3DSCPU = 0x08180040
 	};
 }
 
-namespace Result {
-	enum : u32 {
-		Success = 0,
-	};
-}
-
 void PTMService::reset() {}
 
 void PTMService::handleSyncRequest(u32 messagePointer) {