ide-dma-sff: factor out ide_dma_sff_write_status()

Factor out ide_dma_sff_write_status(), symmetric to ide_dma_sff_read_status().

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