Hook up SERCOM1 to I2C, it is connected to the EXT3 header and
the EDBG embedded debugging interface.
Signed-off-by: Benjamin Valentin <benpicco@googlemail.com>
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>