As the ux500 and the kirkwood driver, make the zynq driver a platform driver
Signed-off-by: NDaniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: NMichal Simek <michal.simek@xilinx.com>
Tested-by: NSoren Brinkmann <soren.brinkmann@xilinx.com>