This driver doesn't support SWDMA so use the correct ->swdma_mask.

While at it:

* no need to call config_chipset_for_pio() in config_chipset_for_dma(),
  if DMA is not available config_chipset_for_pio() will be called
  by siimage_config_drive_for_dma() and if DMA is available
  config_siimage_chipset_for_pio() will be called by siimage_tune_chipset()

* remove needless config_chipset_for_pio() wrapper

* bump driver version

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>