kevin: Add arm_ec_common.xml

On older devices this showed up magically because we used STM32 ECs.
Not so on kevin.  Copy what Oak did and just add this straight into the
main board overlay.

BUG=None
TEST='dut-control --port=8891 ec_uart_multicmd:reboot' now works.

Change-Id: I458b07a7511b60bbf237b8ea2e619c87b7861c1d
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/338230
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-by: Shawn N <shawnn@chromium.org>
1 file changed