Merge pull request adafruit#3869 from jepler/disable-busdevice-in-core

circuitpy_mpconfig.mk: Unconditionally disable CIRCUITPY_BUSDEVICE

Author: dhalbert

py/circuitpy_mpconfig.mk

@@ -96,7 +96,7 @@ CFLAGS += -DCIRCUITPY_BLEIO=$(CIRCUITPY_BLEIO)
 CIRCUITPY_BOARD ?= 1
 CFLAGS += -DCIRCUITPY_BOARD=$(CIRCUITPY_BOARD)
 
-CIRCUITPY_BUSDEVICE ?= $(CIRCUITPY_FULL_BUILD)
+CIRCUITPY_BUSDEVICE = 0
 CFLAGS += -DCIRCUITPY_BUSDEVICE=$(CIRCUITPY_BUSDEVICE)
 
 CIRCUITPY_BUILTINS_POW3 ?= $(CIRCUITPY_FULL_BUILD)