Added qemu toolchain and created zynq ps targets

Signed-off-by: Joppe Blondel <joppe@blondel.nl>

examples/zynq7000/SW/devicetree/skeleton.dtsi

@@ -0,0 +1,13 @@
+/*
+ * Skeleton device tree; the bare minimum needed to boot; just include and
+ * add a compatible value.  The bootloader will typically populate the memory
+ * node.
+ */
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+	chosen { };
+	aliases { };
+	memory { device_type = "memory"; reg = <0 0>; };
+};