ide: destroy DMA mappings after ending DMA (v2)

Move ide_destroy_dmatable() call out from ->dma_end method to
{ide_pc,cdrom_newpc,ide_dma}_intr(), ide_dma_timeout_retry()
and sgiioc4_resetproc().

This causes minor/safe behavior changes w.r.t.:
* cmd64x.c::cmd64{8,x}_dma_end()
* cs5536.c::cs5536_dma_end()
* icside.c::icside_dma_end()
* it821x.c::it821x_dma_end()
* scc_pata.c::__scc_dma_end()
* sl82c105.c::sl82c105_dma_end()
* tx4939ide.c::tx4939ide_dma_end()

v2:
* Fix build for CONFIG_BLK_DEV_IDEDMA=n (reported by Randy Dunlap).

Cc: Randy Dunlap <randy.dunlap@oracle.com>
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ns87415.c

@@ -210,8 +210,6 @@ static int ns87415_dma_end(ide_drive_t *drive)
 	/* from ERRATA: clear the INTR & ERROR bits */
 	dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
 	outb(dma_cmd | 6, hwif->dma_base + ATA_DMA_CMD);
-	/* and free any DMA resources */
-	ide_destroy_dmatable(drive);
 	/* verify good DMA status */
 	return (dma_stat & 7) != 4;
 }