PM / devfreq: Fix Kconfig indentation

Adjust indentation from spaces to tab (+optional two spaces) as in
coding style with command like:
	$ sed -e 's/^        /\t/' -i */Kconfig
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

drivers/devfreq/Kconfig

@@ -120,9 +120,9 @@ config ARM_RK3399_DMC_DEVFREQ
 	select DEVFREQ_GOV_SIMPLE_ONDEMAND
 	select PM_DEVFREQ_EVENT
 	help
-          This adds the DEVFREQ driver for the RK3399 DMC(Dynamic Memory Controller).
-          It sets the frequency for the memory controller and reads the usage counts
-          from hardware.
+	  This adds the DEVFREQ driver for the RK3399 DMC(Dynamic Memory Controller).
+	  It sets the frequency for the memory controller and reads the usage counts
+	  from hardware.
 
 source "drivers/devfreq/event/Kconfig"