[media] cx23885-cardlist.rst: add a new card

add card Hauppauge WinTV-QuadHD-DVB to the list.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/media/v4l-drivers/cx23885-cardlist.rst

@@ -59,3 +59,4 @@ cx23885 cards list
 	 53 -> Hauppauge WinTV Starburst                           [0070:c12a]
 	 54 -> ViewCast 260e                                       [1576:0260]
 	 55 -> ViewCast 460e                                       [1576:0460]
+	 56 -> Hauppauge WinTV-QuadHD-DVB                          [0070:6a28,0070:6b28]