drivers/perf: arm_pmu_acpi: drop redundant acpi_disabled check

acpi_disabled has been checked in armv8_pmu_driver_init and it shall
be ZERO in arm_pmu_acpi_probe, clean up this unnecessary check.
Signed-off-by: NShaokun Zhang <zhangshaokun@hisilicon.com>
Signed-off-by: NWill Deacon <will.deacon@arm.com>

drivers/perf/arm_pmu_acpi.c

@@ -193,9 +193,6 @@ int arm_pmu_acpi_probe(armpmu_init_fn init_fn)
 	int pmu_idx = 0;
 	int cpu, ret;
 
-	if (acpi_disabled)
-		return 0;
-
 	/*
 	 * Initialise and register the set of PMUs which we know about right
 	 * now. Ideally we'd do this in arm_pmu_acpi_cpu_starting() so that we