added missing manifests for wb_irq

modules/wishbone/Manifest.py

@@ -11,6 +11,7 @@ modules =  { "local" : [
   "wb_vic",
   "wb_spi",
   "wb_crossbar",
+  "wb_irq",
   "wb_lm32",
   "wb_slave_adapter",
   "wb_clock_crossing",

modules/wishbone/wb_irq/Manifest.py

+files = ["wb_irq_lm32.vhd",
+         "wb_irq_slave.vhd",
+         "wb_irq_master.vhd",
+         "wb_irq_pkg.vhd"]