cpu/hotplug: Cleanup state names

When the state names got added a script was used to add the extra argument
to the calls. The script basically converted the state constant to a
string, but the cleanup to convert these strings into meaningful ones did
not happen.

Replace all the useless strings with 'subsys/xxx/yyy:state' strings which
are used in all the other places already.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Link: http://lkml.kernel.org/r/20161221192112.085444152@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

drivers/bus/arm-ccn.c

@@ -1562,7 +1562,7 @@ static int __init arm_ccn_init(void)
 	int i, ret;
 
 	ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_ARM_CCN_ONLINE,
-				      "AP_PERF_ARM_CCN_ONLINE", NULL,
+				      "perf/arm/ccn:online", NULL,
 				      arm_ccn_pmu_offline_cpu);
 	if (ret)
 		return ret;