Add 'modem reset' command.

BUG=chromium-os:34348
TEST=Tested 'modem reset' with supported modems.

Change-Id: I92085e107db2b0fb076dfd3eabd548379888d1e7
Reviewed-on: https://gerrit.chromium.org/gerrit/33040
Commit-Ready: Ben Chan <benchan@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
Reviewed-by: Thieu Le <thieule@chromium.org>
1 file changed