ARM: mvebu: add Kirkwood cpuidle to defconfig

The Kirkwood v5 platforms need their CPUIDLE driver, so put it
into the defconfig.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm/configs/mvebu_v5_defconfig

@@ -25,6 +25,7 @@ CONFIG_CPU_FREQ=y
 CONFIG_CPU_FREQ_STAT_DETAILS=y
 CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
 CONFIG_CPU_IDLE=y
+CONFIG_ARM_KIRKWOOD_CPUIDLE=y
 CONFIG_NET=y
 CONFIG_PACKET=y
 CONFIG_UNIX=y