[ARM] Ensure AMBA devices on Versatile have a correct dma_mask

arch/arm/mach-versatile/core.c

@@ -336,6 +336,7 @@ static struct amba_device name##_device = {			\
 		.end	= (VERSATILE_##base##_BASE) + SZ_4K - 1,\
 		.flags	= IORESOURCE_MEM,			\
 	},							\
+	.dma_mask	= ~0,					\
 	.irq		= base##_IRQ,				\
 	/* .dma		= base##_DMA,*/				\
 }