staging: dwc2: fix value of dma_mask

Passing the value DMA_BIT_MASK(31) to dma_set_mask() causes the
dwc2-pci driver to sometimes fail (cannot enumerate the connected
device). Change it to DMA_BIT_MASK(32) instead, which is a more
sensible value anyway.
Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/dwc2/hcd.c

@@ -2804,9 +2804,8 @@ int dwc2_hcd_init(struct dwc2_hsotg *hsotg, int irq,
 
 	/* Set device flags indicating whether the HCD supports DMA */
 	if (hsotg->core_params->dma_enable > 0) {
-		if (dma_set_mask(hsotg->dev, DMA_BIT_MASK(31)) < 0)
-			dev_warn(hsotg->dev,
-				 "can't enable workaround for >2GB RAM\n");
+		if (dma_set_mask(hsotg->dev, DMA_BIT_MASK(32)) < 0)
+			dev_warn(hsotg->dev, "can't set DMA mask\n");
 		if (dma_set_coherent_mask(hsotg->dev, DMA_BIT_MASK(31)) < 0)
 			dev_warn(hsotg->dev,
 				 "can't enable workaround for >2GB RAM\n");