Add 'modem ussd' commands. This CL adds the following modem commands for modems supported by ModemManager, which are exposed via crosh: modem ussd status - Show the status of any ongoing USSD session modem ussd initiate <command> - Initiate a USSD session modem ussd respond <response> - Respond to a USSD request modme ussd cancel - Cancel any ongoing USSD session BUG=chromium:258403 TEST=Tested the crosh commands below with a Y3400 modem connected to T-Mobile: modem ussd modem ussd status modem ussd initiate modem ussd initiate #686# modem ussd respond modem ussd cancel modem ussd bogus-command Change-Id: I92e0cee193d5c2f383394644d9954df85a204d18 Reviewed-on: https://gerrit.chromium.org/gerrit/63312 Reviewed-by: Arman Uguray <armansito@chromium.org> Commit-Queue: Ben Chan <benchan@chromium.org> Tested-by: Ben Chan <benchan@chromium.org>
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