Convert the driver to use struct ide_port_info.

There should be no functional changes caused by this patch.
Acked-by: NMaciej W. Rozycki <macro@linux-mips.org>
Tested-by: NMaciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>