Added the changes related to zap file and the mode supported

Author: shgutte

examples/refrigerator-app/silabs/data_model/BUILD.gn

@@ -17,6 +17,10 @@ import("${chip_root}/src/app/chip_data_model.gni")
 import("${chip_root}/src/platform/device.gni")
 
 chip_data_model("silabs-refrigerator") {
-  zap_file = "refrigerator-app.zap"
+  if (chip_enable_wifi) {
+    zap_file = "refrigerator-wifi-app.zap"
+  } else {
+    zap_file = "refrigerator-thread-app.zap"
+  }
   is_server = true
 }