[ARM] Fix breakage caused by 72486f1f

72486f1f inverted the sense for
enabling hotplug CPU controls without reference to any other
architecture other than i386, ia64 and PowerPC.  This left
everyone else without hotplug CPU control.

Fix ARM for this brain damage.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/kernel/setup.c

@@ -839,8 +839,11 @@ static int __init topology_init(void)
 {
 	int cpu;
 
-	for_each_possible_cpu(cpu)
-		register_cpu(&per_cpu(cpu_data, cpu).cpu, cpu);
+	for_each_possible_cpu(cpu) {
+		struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
+		cpuinfo->cpu.hotpluggable = 1;
+		register_cpu(&cpuinfo->cpu, cpu);
+	}
 
 	return 0;
 }