curiosity: switch back to external flash filesystem

Author: dhalbert

ports/atmel-samd/boards/microchip_curiosity_circuitpython_nano/mpconfigboard.mk

@@ -6,8 +6,7 @@ USB_MANUFACTURER = "Microchip Technology Inc"
 CHIP_VARIANT = SAME51J20A
 CHIP_FAMILY = same51
 
-# QSPI_FLASH_FILESYSTEM = 1
-INTERNAL_FLASH_FILESYSTEM = 1
+QSPI_FLASH_FILESYSTEM = 1
 EXTERNAL_FLASH_DEVICES = "SST26VF016B,SST26VF032B,SST26VF064B"
 LONGINT_IMPL = MPZ
 CIRCUITPY_ULAB = 0