mmc: atmel-mci: remove useless DMA stuff for non-dt devices

All devices with a DMA controller are DT compliant and legacy support
has been removed. For those reasons, some DMA stuff is useless.
Signed-off-by: NLudovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/atmel-mci.c

@@ -2274,17 +2274,9 @@ static void atmci_cleanup_slot(struct atmel_mci_slot *slot,
 
 static bool atmci_configure_dma(struct atmel_mci *host)
 {
-	struct mci_platform_data	*pdata;
-	dma_cap_mask_t mask;
-
 	if (host == NULL)
 		return false;
 
-	pdata = host->pdev->dev.platform_data;
-
-	dma_cap_zero(mask);
-	dma_cap_set(DMA_SLAVE, mask);
-
 	host->dma.chan = dma_request_slave_channel(&host->pdev->dev, "rxtx");
 	if (!host->dma.chan) {
 		dev_warn(&host->pdev->dev, "no DMA channel available\n");