ARM: zynq: DT: Add XADC node

Add node for the Xilinx A/D Converter.

Cc: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/arm/boot/dts/zynq-7000.dtsi

@@ -65,6 +65,14 @@ amba {
 		interrupt-parent = <&intc>;
 		ranges;
 
+		adc@f8007100 {
+			compatible = "xlnx,zynq-xadc-1.00.a";
+			reg = <0xf8007100 0x20>;
+			interrupts = <0 7 4>;
+			interrupt-parent = <&intc>;
+			clocks = <&clkc 12>;
+		};
+
 		i2c0: i2c@e0004000 {
 			compatible = "cdns,i2c-r1p10";
 			status = "disabled";