add PSRAM flag to huidu hd-wf2

for some strange reason this board's flash needs "BOARD_HAS_PSRAM" flag
otherwise it starts in some wrong (RO?) mode were both NVRAM and LittleFS mount fails

Author: vortigont

boards/huidu_hd_wf2.json

@@ -6,6 +6,7 @@
     "core": "esp32",
     "extra_flags": [
       "-DARDUINO_HUIDU_HD_WF2",
+      "-DBOARD_HAS_PSRAM",
       "-DARDUINO_USB_MODE=1",
       "-DARDUINO_RUNNING_CORE=1",
       "-DARDUINO_EVENT_RUNNING_CORE=1",