V4L/DVB (4775): [patch] Add Compro USB IDs

This patch adds Compro Videomate U500 to supported devices.

Signed-off-by: Tomi Koivulahti <birchbay@gmail.com>
Signed-off-by: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>