bus: sunxi-rsb: 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: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20230706072042.31296-1-frank.li@vivo.comSigned-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>

drivers/bus/sunxi-rsb.c

@@ -746,7 +746,6 @@ static int sunxi_rsb_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
-	struct resource *r;
 	struct sunxi_rsb *rsb;
 	u32 clk_freq = 3000000;
 	int irq, ret;
@@ -766,8 +765,7 @@ static int sunxi_rsb_probe(struct platform_device *pdev)
 	rsb->dev = dev;
 	rsb->clk_freq = clk_freq;
 	platform_set_drvdata(pdev, rsb);
-	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	rsb->regs = devm_ioremap_resource(dev, r);
+	rsb->regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(rsb->regs))
 		return PTR_ERR(rsb->regs);