boards: arduino_due: Add arduino_i2c to support list

Correcting pull request review finding to add `arduino_i2c` to the list
of supported items in the .yaml file.

Signed-off-by: Ryan Armstrong <[email protected]>

Author: zerkerX

boards/arm/arduino_due/arduino_due.yaml

@@ -11,3 +11,4 @@ toolchain:
 supported:
   - watchdog
   - gpio
+  - arduino_i2c