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>

diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index d1870c7..2290be3 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -683,7 +683,7 @@ static void __init l2c310_enable(void __iomem *base, unsigned num_lock)
 
 	if (aux & L310_AUX_CTRL_FULL_LINE_ZERO)
 		cpuhp_setup_state(CPUHP_AP_ARM_L2X0_STARTING,
-				  "AP_ARM_L2X0_STARTING", l2c310_starting_cpu,
+				  "arm/l2x0:starting", l2c310_starting_cpu,
 				  l2c310_dying_cpu);
 }