Fixed board m5stick-c (#26)

* Update m5stick-c.json with the correct variant

* Update m5stick-c.json

---------

Co-authored-by: Jason2866 <[email protected]>

Author: sylque

boards/m5stick-c.json

@@ -1,15 +1,12 @@
 {
   "build": {
-    "arduino":{
-      "ldscript": "esp32_out.ld"
-    },
     "core": "esp32",
     "extra_flags": "-DARDUINO_M5Stick_C",
     "f_cpu": "240000000L",
     "f_flash": "40000000L",
     "flash_mode": "dio",
     "mcu": "esp32",
-    "variant": "m5stick_c"
+    "variant": "m5stack_stickc"
   },
   "connectivity": [
     "wifi",