atmel-samd: Correct the UF2 bootloader offset when converting the bin to uf2.
atmel-samd: Correct the UF2 bootloader offset when converting the bin to uf2.

adafruit/circuitpython,adafruit/circuitpython,adafruit/circuitpython,adafruit/circuitpython,adafruit/micropython,adafruit/micropython,adafruit/micropython,adafruit/micropython,adafruit/micropython,adafruit/circuitpython,adafruit/circuitpython