ARM: ux500: cpuidle: Move ux500 cpuidle driver to drivers/cpuidle

There is no more dependency with arch/arm headers, so we can safely move the
driver to the drivers/cpuidle directory.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm
index 2c8f17d..b330219 100644
--- a/drivers/cpuidle/Kconfig.arm
+++ b/drivers/cpuidle/Kconfig.arm
@@ -19,3 +19,11 @@
 	bool "CPU Idle Driver for Xilinx Zynq processors"
 	depends on ARCH_ZYNQ
 	help
+	  Select this to enable cpuidle on Xilinx Zynq processors.
+
+config ARM_U8500_CPUIDLE
+	bool "Cpu Idle Driver for the ST-E u8500 processors"
+	depends on ARCH_U8500
+	help
+	  Select this to enable cpuidle for ST-E u8500 processors
+