cpuidle: remove en_core_tk_irqen flag

The en_core_tk_irqen flag is set in all the cpuidle driver which
means it is not necessary to specify this flag.

Remove the flag and the code related to it.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Kevin Hilman <khilman@linaro.org>  # for mach-omap2/*
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

arch/sh/kernel/cpu/shmobile/cpuidle.c

@@ -55,7 +55,6 @@ static struct cpuidle_device cpuidle_dev;
 static struct cpuidle_driver cpuidle_driver = {
 	.name   = "sh_idle",
 	.owner  = THIS_MODULE,
-	.en_core_tk_irqen = 1,
 	.states = {
 		{
 			.exit_latency = 1,