Vi: Implement ConvertScalingMode (#581)

* Vi: Implement ConvertScalingMode

For now, it seems Nintendo just map 1:1 between the two enums.

* Resolve style nits

* Vi: Correct mapping order

Ryujinx.HLE/HOS/Services/Vi/ScalingMode.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Ryujinx.HLE.HOS.Services.Vi
+{
+    enum SrcScalingMode
+    {
+        Freeze = 0,
+        ScaleToWindow = 1,
+        ScaleAndCrop = 2,
+        None = 3,
+        PreserveAspectRatio = 4
+    }
+
+    enum DstScalingMode
+    {
+        None = 0,
+        Freeze = 1,
+        ScaleToWindow = 2,
+        ScaleAndCrop = 3,
+        PreserveAspectRatio = 4
+    }
+}