V4L/DVB (7623): Scripts to maintain the CARDLIST file

Scripts to maintain the CARDLIST file.
Signed-off-by: NSteven Toth <stoth@hauppauge.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

Documentation/video4linux/CARDLIST.au0828

+  0 -> Unknown board                            (au0828)
+  1 -> Hauppauge HVR950Q                        (au0828)        [2040:7200]
+  2 -> Hauppauge HVR850                         (au0828)        [2040:7240]
+  3 -> DViCO FusionHDTV USB                     (au0828)        [0fe9:d620]