eagle: refer to bank ids [1,2] instead of [0,1]

iopsys-brcm63xx-arm/eagle/base-files/etc/system_layout/EX600.json

@@ -2,13 +2,13 @@
   "type": "nand",
   "banks": [
     {
-      "id": 0,
+      "id": 1,
       "name": "A",
       "rootfs": "/dev/ubiblock0_4",
       "overlay": "ubi0:overlay1"
     },
     {
-      "id": 1,
+      "id": 2,
       "name": "B",
       "rootfs": "/dev/ubiblock0_6",
       "overlay": "ubi0:overlay2"