cpuidle: big.LITTLE: init driver for exynos5420

Add "samsung,exynos5420" compatible string to initialize generic
big-little cpuidle driver for Exynos5420.

Signed-off-by: Chander Kashyap <chander.kashyap@linaro.org>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

drivers/cpuidle/cpuidle-big_little.c

@@ -165,6 +165,7 @@ static int __init bl_idle_driver_init(struct cpuidle_driver *drv, int cpu_id)
 
 static const struct of_device_id compatible_machine_match[] = {
 	{ .compatible = "arm,vexpress,v2p-ca15_a7" },
+	{ .compatible = "samsung,exynos5420" },
 	{},
 };