ARM: zynq: use zynq clk bindings

Make the Zynq platform use the newly created zynq clk bindings.

Signed-off-by: Josh Cartwright <josh.cartwright@ni.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>

arch/arm/boot/dts/zynq-zc702.dts

@@ -28,3 +28,7 @@
 	};
 
 };
+
+&ps_clk {
+	clock-frequency = <33333330>;
+};