eclass-overlay: add modem user to usb group

This allows modemfwd to open usb devices so it can update
modems.

CQ-DEPEND=CL:874998
BUG=b:37953355
TEST=run modemfwd as modem user and ensure it can update modem

Change-Id: I5d09304a04d4bc4379cc2f7979e843546cf31adc
Reviewed-on: https://chromium-review.googlesource.com/868733
Commit-Ready: Eric Caruso <ejcaruso@chromium.org>
Tested-by: Eric Caruso <ejcaruso@chromium.org>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
1 file changed
tree: b35ceadb80d2505a2af86121ac8fb34006ba436f
  1. eclass/
  2. metadata/
  3. profiles/
  4. PRESUBMIT.cfg