Enable CS "active-high" device support #1
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Reference adafruit/Adafruit_CircuitPython_BusDevice#71 Add a new parameter cs_active_value for devices that require CS to use "active high" logic. Update mpconfigboard.mk to disable pyb_nano_v2 from core build as its flash is too small now.
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Reference adafruit/Adafruit_CircuitPython_BusDevice#71
Enables SPIDevice to be used for things like the Sitronix ST7920 LCD display which requires CS to be pulled high during commands or data transfers.