[libata] pata_bf54x: Support sg list in bmdma transfer.
BF54x on-chip ATAPI controller allows maximum 0x1fffe bytes to be transfered in one ATAPI transfer. So, set the max sg_tablesize to 4. Signed-off-by: NSonic Zhang <sonic.zhang@analog.com> Signed-off-by: NJeff Garzik <jgarzik@redhat.com>
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