media: admin-guide: add a cardlist for all other USB cards

There are several other USB cards. Most of them support just
one device. The only exception is the "pwc" driver. But, as
updates to it are not frequent, let's just place everything
manually into a single file.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>