perf: xgene_pmu: Convert to devm_platform_ioremap_resource()

Use devm_platform_ioremap_resource() to simplify code.
Signed-off-by: Yangtao Li <frank.li@vivo.com>
Link: https://lore.kernel.org/r/20230704093556.17926-1-frank.li@vivo.comSigned-off-by: Will Deacon <will@kernel.org>

drivers/perf/xgene_pmu.c

@@ -1833,7 +1833,6 @@ static int xgene_pmu_probe(struct platform_device *pdev)
 	const struct xgene_pmu_data *dev_data;
 	const struct of_device_id *of_id;
 	struct xgene_pmu *xgene_pmu;
-	struct resource *res;
 	int irq, rc;
 	int version;
 
@@ -1883,8 +1882,7 @@ static int xgene_pmu_probe(struct platform_device *pdev)
 	xgene_pmu->version = version;
 	dev_info(&pdev->dev, "X-Gene PMU version %d\n", xgene_pmu->version);
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	xgene_pmu->pcppmu_csr = devm_ioremap_resource(&pdev->dev, res);
+	xgene_pmu->pcppmu_csr = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(xgene_pmu->pcppmu_csr)) {
 		dev_err(&pdev->dev, "ioremap failed for PCP PMU resource\n");
 		return PTR_ERR(xgene_pmu->pcppmu_csr);