V4L/DVB (6541): Add V-Gear PocketTV to Cardlist.em28xx

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

Documentation/video4linux/CARDLIST.em28xx

@@ -13,3 +13,4 @@
  12 -> Kworld PVR TV 2800 RF                    (em2820/em2840)
  13 -> Terratec Prodigy XS                      (em2880)
  14 -> Pixelview Prolink PlayTV USB 2.0         (em2820/em2840)
+ 15 -> V-Gear PocketTV                          (em2800)