memory: mvebu-devbus: convert to devm_platform_ioremap_resource

	struct devbus_read_params r;

	struct devbus_write_params w;

	struct devbus *devbus;

	struct resource *res;

	struct clk *clk;

	unsigned long rate;

	int err;

		return -ENOMEM;

	devbus->dev = dev;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	devbus->base = devm_ioremap_resource(&pdev->dev, res);

	devbus->base = devm_platform_ioremap_resource(pdev, 0);

	if (IS_ERR(devbus->base))

		return PTR_ERR(devbus->base);