Added qemu toolchain and created zynq ps targets

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

examples/zynq7000/SW/src/main.c

@@ -6,7 +6,7 @@
 void main(){
     cpu_disable_interrups();
     // Initialize ZYNQ Processing System
-    ps7_init();
+    // ps7_init();
     // Start UART
     uart_setup();