Fix reboot test for devices with Gobi modem

Adding logic to check if the device has a gobi modem and fixing the
messaging when gobi modem is detected.

BUG=chromium:385869
TEST=Tested on duts with both gobi and non-gobi modems in the lab.

Change-Id: I790fa55ee8640f2604ccb26f3b644f3a388acebc
Reviewed-on: https://chromium-review.googlesource.com/204601
Reviewed-by: Kris Rambish <krisr@chromium.org>
Reviewed-by: harpreet Grewal <harpreet@chromium.org>
Commit-Queue: harpreet Grewal <harpreet@chromium.org>
Tested-by: harpreet Grewal <harpreet@chromium.org>
1 file changed