perf/smmuv3: To simplify code for ioremap page in pmcg

Use the devm_platform_get_and_ioremap_resource to simplify the code
a bit.

Signed-off-by: Jay Chen <jkchen@linux.alibaba.com>
Link: https://lore.kernel.org/r/20200706112246.92220-2-jkchen@linux.alibaba.com
Signed-off-by: Will Deacon <will@kernel.org>

drivers/perf/arm_smmuv3_pmu.c

@@ -755,8 +755,7 @@ static int smmu_pmu_probe(struct platform_device *pdev)
 		.capabilities	= PERF_PMU_CAP_NO_EXCLUDE,
 	};
 
-	res_0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	smmu_pmu->reg_base = devm_ioremap_resource(dev, res_0);
+	smmu_pmu->reg_base = devm_platform_get_and_ioremap_resource(pdev, 0, &res_0);
 	if (IS_ERR(smmu_pmu->reg_base))
 		return PTR_ERR(smmu_pmu->reg_base);