ARM: ux500: set coherent_dma_mask for dma40

Set coherent_dma_mask to DMA_BIT_MASK(32) for dma40 platform_device, as
without this DMA allocations were failing with the error:

dma40 dma40.0: coherent DMA mask is unset

when booting without device-tree.
Signed-off-by: NFabio Baltieri <fabio.baltieri@linaro.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

arch/arm/mach-ux500/devices-db8500.c

@@ -49,6 +49,7 @@ struct stedma40_platform_data dma40_plat_data = {
 struct platform_device u8500_dma40_device = {
 	.dev = {
 		.platform_data = &dma40_plat_data,
+		.coherent_dma_mask = DMA_BIT_MASK(32),
 	},
 	.name = "dma40",
 	.id = 0,