cpuidle / kirkwood: remove redundant Kconfig option

When the CPU_IDLE and the ARCH_KIRKWOOD options are set it is
pointless to define a new option CPU_IDLE_KIRKWOOD because it
is redundant.

The Makefile drivers directory contains a condition to compile
the cpuidle drivers:

obj-$(CONFIG_CPU_IDLE)          += cpuidle/

Hence, if CPU_IDLE is not set we won't enter this directory.

This patch removes the useless Kconfig option and replaces the
condition in the Makefile by CONFIG_ARCH_KIRKWOOD.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

arch/arm/configs/kirkwood_defconfig

@@ -56,7 +56,6 @@ CONFIG_AEABI=y
 CONFIG_ZBOOT_ROM_TEXT=0x0
 CONFIG_ZBOOT_ROM_BSS=0x0
 CONFIG_CPU_IDLE=y
-CONFIG_CPU_IDLE_KIRKWOOD=y
 CONFIG_NET=y
 CONFIG_PACKET=y
 CONFIG_UNIX=y

drivers/cpuidle/Kconfig

@@ -39,10 +39,4 @@ config CPU_IDLE_CALXEDA
 	help
 	  Select this to enable cpuidle on Calxeda processors.
 
-config CPU_IDLE_KIRKWOOD
-	bool "CPU Idle Driver for Kirkwood processors"
-	depends on ARCH_KIRKWOOD
-	help
-	  Select this to enable cpuidle on Kirkwood processors.
-
 endif

drivers/cpuidle/Makefile

@@ -6,4 +6,4 @@ obj-y += cpuidle.o driver.o governor.o sysfs.o governors/
 obj-$(CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED) += coupled.o
 
 obj-$(CONFIG_CPU_IDLE_CALXEDA) += cpuidle-calxeda.o
-obj-$(CONFIG_CPU_IDLE_KIRKWOOD) += cpuidle-kirkwood.o
+obj-$(CONFIG_ARCH_KIRKWOOD) += cpuidle-kirkwood.o