cellular: Update network_3GRecoverFromGobiDesync to use mm.py from autotest

This CL updates the network_3GRecoverFromGobiDesync test to use the
mm.py from autotest_lib.client.cros.cellular instead of the one from
shill-test-scripts as the latter is deprecated and replaced by the
former.

BUG=chromium:404003
TEST=Run network_3GDormancyDance test on DUTs with gobi2k and gobi3k.

Change-Id: I7537e02c8d9ca8f0422222bfa8785d8f1e8631c9
Reviewed-on: https://chromium-review.googlesource.com/212570
Reviewed-by: Ben Chan <benchan@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
Commit-Queue: Ben Chan <benchan@chromium.org>
1 file changed