further reduce code and memory usage

Author: bradanlane

ports/atmel-samd/boards/bradanlanestudio_coin_m0/mpconfigboard.mk

@@ -18,21 +18,39 @@ CHIP_FAMILY = samd21
 
 SPI_FLASH_FILESYSTEM = 1
 EXTERNAL_FLASH_DEVICES = "W25Q32JVxQ"
-LONGINT_IMPL = MPZ
+LONGINT_IMPL = NONE
 
 # the M0 Coin has limited functionality and many modules can be eliminated
 
 # there may be more modules which are of no used but will require further digging
 
+# Disable modules that are unusable on this special-purpose board.
+
+CIRCUITPY_FULL_BUILD = 0
+
+CIRCUITPY_AESIO = 0
+CIRCUITPY_AUDIOBUSIO = 0
+CIRCUITPY_AUDIOIO = 1
+CIRCUITPY_BITBANGIO = 0
+CIRCUITPY_BITMAPFILTER = 0
+CIRCUITPY_BITMAPTOOLS = 0
+CIRCUITPY_BLEIO = 0
+CIRCUITPY_BLEIO_HCI = 0
 CIRCUITPY_DISPLAYIO = 0
-CIRCUITPY_PULSEIO = 0
-CIRCUITPY_RTC = 0
+CIRCUITPY_FRAMEBUFFERIO = 0
+CIRCUITPY_FREQUENCYIO = 0
+CIRCUITPY_I2CTARGET = 0
+CIRCUITPY_KEYPAD = 0
 CIRCUITPY_ONEWIREIO = 0
+CIRCUITPY_PS2IO = 0
+CIRCUITPY_PULSEIO = 0
+CIRCUITPY_RGBMATRIX = 0
 CIRCUITPY_ROTARYIO = 0
+CIRCUITPY_RTC = 0
+CIRCUITPY_TOUCHIO = 1
+CIRCUITPY_USB_HID = 1
+CIRCUITPY_USB_MIDI = 0
 
-CIRCUITPY_BITBANGIO = 1
-CIRCUITPY_COUNTIO = 1
-CIRCUITPY_BUSDEVICE = 1
 
 # Include these Python libraries in firmware.
 FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_HID