arduino_nano_esp32.json: flash recovery image

Author: Jason2866

boards/arduino_nano_esp32.json

@@ -41,6 +41,14 @@
   ],
   "name": "Arduino Nano ESP32",
   "upload": {
+    "arduino": {
+      "flash_extra_images": [
+        [
+          "0xf70000",
+          "variants/arduino_nano_nora/extra/nora_recovery/nora_recovery.ino.bin"
+        ]
+      ]
+    },
     "flash_size": "16MB",
     "maximum_ram_size": 327680,
     "maximum_size": 16777216,