[PATCH] libata irq-pio: merge the ata_dataout_task workqueue with ata_pio_task workqueue

   - remove ap->dataout_task from struct ata_port
   - let ata_pio_task() handle the HSM_ST_FIRST state.
   - rename ata_dataout_task() to ata_pio_first_block()
   - replace the ata_dataout_task workqueue with ata_pio_task workqueue

Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
========
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>