[libata] ata_piix: minor cleanups noticed in prior patch run
* delete unused PIIX_FLAG_COMBINED*
* port_enable should be u16 rather than u32
Signed-off-by: Jeff Garzik <jeff@garzik.org>
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* delete unused PIIX_FLAG_COMBINED*
* port_enable should be u16 rather than u32
Signed-off-by: Jeff Garzik <jeff@garzik.org>