servo_micro: fix typo in xml

Fix interface numbering typo in servo_micro.xml

BUG=chromium:571477
TEST=sudo servod -c servo_micro.xml, no errors
BRANCH=none

Change-Id: I1c99a10ff281ece486aea5e45c87ee40bed66776
Signed-off-by: Nick Sanders <nsanders@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/353365
Reviewed-by: Todd Broch <tbroch@chromium.org>
1 file changed