Drop support for Windows 10 IoT

Author: pgrawehr

src/System.Device.Gpio.Tests/WindowsDriverTests.cs

@@ -151,11 +151,7 @@ RaspberryBoardInfo.Model.RaspberryPiComputeModule4 or
     [MethodImpl(MethodImplOptions.NoInlining)]
     private static GpioDriver CreateWindows10GpioDriver()
     {
-        // This wrapper is needed to prevent Mono from loading Windows10Driver
-        // which causes all fields to be loaded - one of such fields is WinRT type which does not
-        // exist on Linux which causes TypeLoadException.
-        // Using NoInlining and no explicit type prevents this from happening.
-        return new Windows10Driver();
+        throw new PlatformNotSupportedException();
     }
 
     private GpioDriver InternalDriver