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May need to move servo v4 to a newer branch and this would be required to make that happen. I'll take a look and fix if it's straightforward.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/platform/ec/+/1356a1a5b747bb9159e8e71db03a9f93a196b245

commit 1356a1a5b747bb9159e8e71db03a9f93a196b245
Author: Nick Sanders <nsanders@chromium.org>
Date: Thu May 10 09:27:11 2018

usb_updater2: match by serial number

Add a serial number match to allow update of servo or
other usb devices, where mutliple devices may be attached
to one system.

BRANCH=None
BUG= chromium:718688 
TEST=usb_updater2 -d 18d1:501b --serial=[C1706311869|fail]

Signed-off-by: Nick Sanders <nsanders@chromium.org>
Change-Id: Id6ec944139e685948433af703555fd185e91a9d4
Reviewed-on: https://chromium-review.googlesource.com/1050971
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>

[modify] https://crrev.com/1356a1a5b747bb9159e8e71db03a9f93a196b245/extra/usb_updater/usb_updater2.c