ARM: zynq: Add cpuidle support

Add cpuidle support for Xilinx Zynq.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/cpuidle/Kconfig b/drivers/cpuidle/Kconfig
index e997f15..a7d2e83 100644
--- a/drivers/cpuidle/Kconfig
+++ b/drivers/cpuidle/Kconfig
@@ -37,4 +37,11 @@
 	depends on ARCH_HIGHBANK
 	help
 	  Select this to enable cpuidle on Calxeda processors.
+
+config CPU_IDLE_ZYNQ
+	bool "CPU Idle Driver for Xilinx Zynq processors"
+	depends on ARCH_ZYNQ
+	help
+	  Select this to enable cpuidle on Xilinx Zynq processors.
+
 endif