aec62xx: remove ->init_setup

Merge init_setup_{aec62xx,aec6x80}() into aec62xx_init_one().

While at it:

* Use id->driver_data instead of dev->device.

* Use ATA_UDMA6 define.

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>