It's a storage device, so let's classify it accordingly. And
while we're at it, also add a short description for people who
do not know what MTP means.
Signed-off-by: NThomas Huth <thuth@redhat.com>
Reviewed-by: NLaurent Vivier <laurent@vivier.eu>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>