opti621: add PIO 4 support
* Add PIO 4 support. While at it: * Use a single struct ide_port_info instance for OPTi621 and OPTi621X. Based on a bugreport from Juergen Kosel & inspired by pata_opti.c code. Tested-by: NJuergen Kosel <juergen.kosel@gmx.de> Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
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