Use CUSTOM_BOARD_DIR

Author: MATTYGILO

firmware/boards/ESP32_GENERIC_S3/mpconfigboard.cmake

@@ -1,7 +1,7 @@
 set(IDF_TARGET esp32s3)
 
 set(SDKCONFIG_DEFAULTS
-    sdkconfig.base
+    ${CUSTOM_BOARD_DIR}/../sdkconfig.base
     ${MICROPY_ESP32_DIR}/boards/sdkconfig.usb
     ${MICROPY_ESP32_DIR}/boards/sdkconfig.ble
     ${MICROPY_ESP32_DIR}/boards/sdkconfig.spiram_sx