palm_bk3710: use struct ide_port_info

* Factor out cable detection to palm_bk3710_cable_detect().

* Add palm_bk3710_init_hwif() (->init_hwif method implementation).

* Remove needless ->quirkproc initialization.

* Add missing ->pio_mask initialization.

* Use ATA_* defines for setting ->{ultra,mwdma}_mask.

* Add 'struct ide_port_info palm_bk3710_port_info' and pass it to
  ide_device_add().  Then remove open-coded 'hwif' initialization.

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