boards: atsamr21_xpro: Add SAM R21 Xplained Pro Evaluation Kit
Add the Atmel SAM R21 Xplained Pro Evaluation Kit to zephyr.
So far, UART, SPI, I2C (depends on #14128), debug LED and user button
have been tested.
Signed-off-by:
Benjamin Valentin <benpicco@googlemail.com>
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