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 <git@zerker.ca>
diff --git a/boards/arm/arduino_due/arduino_due.yaml b/boards/arm/arduino_due/arduino_due.yaml
index 6ca7e26..3532f3a 100644
--- a/boards/arm/arduino_due/arduino_due.yaml
+++ b/boards/arm/arduino_due/arduino_due.yaml
@@ -11,3 +11,4 @@
 supported:
   - watchdog
   - gpio
+  - arduino_i2c