Add IRQ 12 setting to NE2000. Patch from EluanCM.

src/ne2000.c

@@ -2010,6 +2010,10 @@ static device_config_t ne2000_config[] =
                                 .description = "IRQ 11",
                                 .value = 11
                         },
+                        {
+                                .description = "IRQ 12",
+                                .value = 12
+                        },
                         {
                                 .description = ""
                         }