kms: Send enter and leave events to all screens

Propage event to all sibling screens resulting in enter and leave
events being properly sent.

Change-Id: Ia89d53105f6303fae3f304ce0920b5a4a24f86ae
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

src/plugins/platforms/eglfs/deviceintegration/eglfs_kms/qeglfskmsgbmcursor.cpp

@@ -240,6 +240,8 @@ void QEglFSKmsGbmCursor::setPos(const QPoint &pos)
             m_pos = pos;
         else
             qWarning("Failed to move cursor on screen %s: %d", kmsScreen->name().toLatin1().constData(), ret);
+
+        kmsScreen->handleCursorMove(pos);
     }
 }