Update LD scripts for new boards

Author: ivankravets

boards/heltek_kit_8.json

@@ -5,7 +5,7 @@
     "f_cpu": "80000000L",
     "f_flash": "40000000L",
     "flash_mode": "dio",
-    "ldscript": "esp8266.flash.4m1m.ld",
+    "ldscript": "eagle.flash.4m1m.ld",
     "mcu": "esp8266",
     "variant": "d1_mini"
   },

boards/wio_node.json

@@ -5,7 +5,7 @@
     "f_cpu": "80000000L",
     "f_flash": "40000000L",
     "flash_mode": "qio",
-    "ldscript": "esp8266.flash.4m1m.ld",
+    "ldscript": "eagle.flash.4m1m.ld",
     "mcu": "esp8266",
     "variant": "nodemcu"
   },