Fix maximum RAM size for ESP32-C6-DevKitC-1

Author: valeros

boards/esp32-c6-devkitc-1.json

@@ -15,7 +15,7 @@
   "name": "Espressif ESP32-C6-DevKitC-1",
   "upload": {
     "flash_size": "8MB",
-    "maximum_ram_size": 524288,
+    "maximum_ram_size": 327680,
     "maximum_size": 8388608,
     "require_upload_port": true,
     "speed": 460800