Relax IDE CHS limits from 16383,16,63 to 65535,16,255

New limits straight from ATA4 6.2 Register delivered data transfer
command sector addressing.

I figure the old sector limit 63 was blindly copied from the BIOS
int 13 limit.  Doesn't apply to the hardware.  No idea where the old
cylinder limit comes from.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
