fix spi

Author: brentru

src/busio.py

@@ -441,6 +441,8 @@ def configure(self, baudrate=100000, polarity=0, phase=0, bits=8):
             from adafruit_blinka.microcontroller.am65xx.pin import Pin
         elif detector.board.any_embedded_linux:
             from adafruit_blinka.microcontroller.generic_linux.spi import SPI as _SPI
+        elif detector.board.OS_AGNOSTIC_BOARD:
+            from adafruit_blinka.microcontroller.generic_agnostic_board.spi import SPI as _SPI
         else:
             from adafruit_blinka.microcontroller.generic_micropython.spi import (
                 SPI as _SPI,