cellular: Run network_3GSmokeTest.pseudomodem with CDMA.

Extended the control file to run the test once on a 3GPP modem and once
on a CDMA modem. Also simplified the TestModemManagerContext
initialization to set up default modems based on a 'family' flag.

BUG=chromium:240423,chromium:240015
TEST=Running network_3GSmokeTest/control.pseudomodem should pass.

Change-Id: Id4d97e612490402361dea177805a9c5ba3999b75
Reviewed-on: https://gerrit.chromium.org/gerrit/51048
Commit-Queue: Arman Uguray <armansito@chromium.org>
Reviewed-by: Arman Uguray <armansito@chromium.org>
Tested-by: Arman Uguray <armansito@chromium.org>
4 files changed