Add cpuidle support for Xilinx Zynq.
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>
Acked-by: NDaniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>