nrf: simmel: shrink filesystem to fit watchdog timer

The watchdog timer has increased the amount of code and text that's
required.

Signed-off-by: Sean Cross <[email protected]>

Author: xobs

ports/nrf/boards/simmel/mpconfigboard.h

@@ -40,7 +40,7 @@
 #endif
 
 #define CIRCUITPY_INTERNAL_NVM_SIZE 0
-#define CIRCUITPY_INTERNAL_FLASH_FILESYSTEM_SIZE (80*1024)
+#define CIRCUITPY_INTERNAL_FLASH_FILESYSTEM_SIZE (76*1024)
 
 #define BOOTLOADER_SIZE                 (0x4000)  // 12 kiB
 #define CIRCUITPY_BLE_CONFIG_SIZE       (12*1024)