adding changes to mpconfigboard.mk to reduce memory usage on CPX per @danh

Author: ATMakersBill

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

@@ -17,3 +17,6 @@ FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_HID
 FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_LIS3DH
 FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_NeoPixel
 FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_Thermistor
+
+#Adding per @danh to reduce memory usage and get the latest changes in
+CFLAGS_INLINE_LIMIT = 55