piix/slc90e66: fix PIO1 handling in ->speedproc method (take 2)

* Don't call {piix,slc90e66}_dma_2_pio() for PIO modes in
  {piix,slc90e66}_tune_chipset().

* Add PIO1 handling to {piix,slc90e66}_tune_chipset().

* Bump driver version.  

v2:
* Remove PIO modes from {piix,slc90e66}_dma_2_pio(), they are no longer needed
  there (Noticed by Sergei)

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