mmc: davinci_mmc: allow driver to work without DMA resource

Do not return probe failure with missing DMA resources, allow driver
to work in PIO mode.  Tested on da850-evm by mounting partition
followed by file creation and deletion.
Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com>
Tested-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/host/davinci_mmc.c

@@ -1190,12 +1190,14 @@ static int __init davinci_mmcsd_probe(struct platform_device *pdev)
 
 	r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 	if (!r)
-		goto out;
+		dev_warn(&pdev->dev, "RX DMA resource not specified\n");
+	else
 		host->rxdma = r->start;
 
 	r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 	if (!r)
-		goto out;
+		dev_warn(&pdev->dev, "TX DMA resource not specified\n");
+	else
 		host->txdma = r->start;
 
 	host->mem_res = mem;