V4L/DVB: cx23885: Add support for LEADTEK WinFast PxTV1200

I tested only tv and composite. Video works fine but no audio.

Signed-off-by: Kusanagi Kouichi <slash@ac.auone-net.jp>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/Documentation/video4linux/CARDLIST.cx23885 b/Documentation/video4linux/CARDLIST.cx23885
index 7539e8f..16ca030 100644
--- a/Documentation/video4linux/CARDLIST.cx23885
+++ b/Documentation/video4linux/CARDLIST.cx23885
@@ -26,3 +26,4 @@
  25 -> Compro VideoMate E800                               [1858:e800]
  26 -> Hauppauge WinTV-HVR1290                             [0070:8551]
  27 -> Mygica X8558 PRO DMB-TH                             [14f1:8578]
+ 28 -> LEADTEK WinFast PxTV1200                            [107d:6f22]