icside: register second channel of version 6 PCB

The second IDE channel of version 6 PCB is not being registered anymore since
the commit 48c3c107

 (ide: add struct ide_host
(take 3)).

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>