* move idedisk_error() and ide_cdrom_error() to ide-io.c
* rename idedisk_error() to ide_ata_error()
* rename ide_cdrom_error() to ide_atapi_error()
* use ide_{ata,atapi}_error() in ide_error()
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>