Fix the iOS/tvOS platform plugin build on tvOS

This fixes a regression from ba44cdae38.

Task-number: QTBUG-65516
Change-Id: I989b075d3f96170660042349437e4a6a4a115cf9
Reviewed-by: Liang Qi <liang.qi@qt.io>

src/plugins/platforms/ios/quiview.mm

@@ -58,6 +58,7 @@
 
 + (void)load
 {
+#ifndef Q_OS_TVOS
     if (QOperatingSystemVersion::current() < QOperatingSystemVersion(QOperatingSystemVersion::IOS, 11)) {
         // iOS 11 handles this though [UIView safeAreaInsetsDidChange], but there's no signal for
         // the corresponding top and bottom layout guides that we use on earlier versions. Note
@@ -72,6 +73,7 @@
             }
         ];
     }
+#endif
 }
 
 + (Class)layerClass