Fixed namespaces

src/Android/Avalonia.Android/Platform/SkiaPlatform/AndroidFramebuffer.cs

@@ -2,7 +2,7 @@ using System;
 using System.Runtime.InteropServices;
 using Android.Runtime;
 using Android.Views;
-using Avalonia.Controls.Platform.Surfaces;
+using Avalonia.Platform;
 
 namespace Avalonia.Android.Platform.SkiaPlatform
 {

src/iOS/Avalonia.iOS/EmulatedFramebuffer.cs

@@ -2,7 +2,7 @@
 using System.Collections.Generic;
 using System.Runtime.InteropServices;
 using System.Text;
-using Avalonia.Controls.Platform.Surfaces;
+using Avalonia.Platform;
 using CoreGraphics;
 using UIKit;