Update specs for Denky D4 (platformio#887)

Author: Jason2866

boards/denky_d4.json

@@ -10,7 +10,7 @@
     ],
     "f_cpu": "240000000L",
     "f_flash": "80000000L",
-    "flash_mode": "dio",
+    "flash_mode": "qio",
     "mcu": "esp32",
     "variant": "ch_denky"
   },
@@ -26,11 +26,11 @@
   ],
   "name": "Denky D4 (PICO-V3-02)",
   "upload": {
-    "flash_size": "4MB",
+    "flash_size": "8MB",
     "maximum_ram_size": 327680,
-    "maximum_size": 4194304,
+    "maximum_size": 8388608,
     "require_upload_port": true,
-    "speed": 460800
+    "speed": 2000000
   },
   "url": "https://en.wikipedia.org/wiki/ESP32",
   "vendor": "Denky"