ide-cris: fix ->speedproc and wrong ->swdma_mask

* fix ->speedproc to set the drive speed

* this driver doesn't support SWDMA so use the correct ->swdma_mask

* BUG() if an unsupported mode is passed to ->speedproc

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