pata_via: fix VT6410/6415/6330 detection issue

When using VT6410/6415/6330 chips on some VIA's platforms, the HDD
connection to VT6410/6415/6330 cannot be detected.

It is because the driver detects wrong via_isa_bridge ID, and then
causes this issue to happen.

Signed-off-by: Joseph Chan <josephchan@via.com.tw>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>