ARM: perf: consistently use arm_pmu->name for PMU name

Perf has three ways to name a PMU: either by passing an explicit char *,
reading arm_pmu->name or accessing arm_pmu->pmu.name.

Just use arm_pmu->name consistently in the ARM backend.

Signed-off-by: Will Deacon <will.deacon@arm.com>
diff --git a/arch/arm/include/asm/pmu.h b/arch/arm/include/asm/pmu.h
index a209a38..f24edad 100644
--- a/arch/arm/include/asm/pmu.h
+++ b/arch/arm/include/asm/pmu.h
@@ -93,7 +93,7 @@
 
 extern const struct dev_pm_ops armpmu_dev_pm_ops;
 
-int armpmu_register(struct arm_pmu *armpmu, char *name, int type);
+int armpmu_register(struct arm_pmu *armpmu, int type);
 
 u64 armpmu_event_update(struct perf_event *event);