fpga: xilinx-pr-decoupler: Convert to devm_platform_ioremap_resource()

Use devm_platform_ioremap_resource() to simplify code.
Signed-off-by: Yangtao Li <frank.li@vivo.com>
Acked-by: Michal Simek <michal.simek@amd.com>
Acked-by: Xu Yilun <yilun.xu@intel.com>
Link: https://lore.kernel.org/r/20230705094655.44753-5-frank.li@vivo.comSigned-off-by: Xu Yilun <yilun.xu@intel.com>

drivers/fpga/xilinx-pr-decoupler.c

@@ -108,7 +108,6 @@ static int xlnx_pr_decoupler_probe(struct platform_device *pdev)
 	struct xlnx_pr_decoupler_data *priv;
 	struct fpga_bridge *br;
 	int err;
-	struct resource *res;
 
 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
@@ -122,8 +121,7 @@ static int xlnx_pr_decoupler_probe(struct platform_device *pdev)
 			priv->ipconfig = match->data;
 	}
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	priv->io_base = devm_ioremap_resource(&pdev->dev, res);
+	priv->io_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(priv->io_base))
 		return PTR_ERR(priv->io_base);