ARM: 9412/1: Convert to arch_cpu_is_hotpluggable()

Convert arm32 to use the arch_cpu_is_hotpluggable() helper rather than
arch_register_cpu().
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

arch/arm/kernel/setup.c

@@ -1201,12 +1201,9 @@ void __init setup_arch(char **cmdline_p)
 		mdesc->init_early();
 }
 
-int arch_register_cpu(int num)
+bool arch_cpu_is_hotpluggable(int num)
 {
-	struct cpu *cpu = &per_cpu(cpu_devices, num);
-
-	cpu->hotpluggable = platform_can_hotplug_cpu(num);
-	return register_cpu(cpu, num);
+	return platform_can_hotplug_cpu(num);
 }
 
 #ifdef CONFIG_HAVE_PROC_CPU