ide: move read_sff_dma_status() method to 'struct ide_dma_ops'

Move apparently misplaced read_sff_dma_status() method from 'struct ide_tp_ops'
to 'struct ide_dma_ops', renaming it to dma_sff_read_status() and making only
required for SFF-8038i compatible IDE controller drivers (greatly cutting down
the number of initializers) as its only user (outside ide-dma-sff.c and such
drivers) appears to be ide_pci_check_simplex() which is only called for such
controllers...

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

drivers/ide/cmd64x.c

@@ -385,6 +385,7 @@ static const struct ide_dma_ops cmd64x_dma_ops = {
 	.dma_test_irq		= cmd64x_dma_test_irq,
 	.dma_lost_irq		= ide_dma_lost_irq,
 	.dma_timeout		= ide_dma_timeout,
+	.dma_sff_read_status	= ide_dma_sff_read_status,
 };
 
 static const struct ide_dma_ops cmd646_rev1_dma_ops = {
@@ -396,6 +397,7 @@ static const struct ide_dma_ops cmd646_rev1_dma_ops = {
 	.dma_test_irq		= ide_dma_test_irq,
 	.dma_lost_irq		= ide_dma_lost_irq,
 	.dma_timeout		= ide_dma_timeout,
+	.dma_sff_read_status	= ide_dma_sff_read_status,
 };
 
 static const struct ide_dma_ops cmd648_dma_ops = {
@@ -407,6 +409,7 @@ static const struct ide_dma_ops cmd648_dma_ops = {
 	.dma_test_irq		= cmd648_dma_test_irq,
 	.dma_lost_irq		= ide_dma_lost_irq,
 	.dma_timeout		= ide_dma_timeout,
+	.dma_sff_read_status	= ide_dma_sff_read_status,
 };
 
 static const struct ide_port_info cmd64x_chipsets[] __devinitdata = {