Open GdmDevice before exposing it to DBus to trigger MAC address update.

BUG=chrome-os-partner:10674
TEST=Tested with corresponding changes in shill and verified that shill
obtains the correct MAC address of the WiMAX device the system resumes
from suspend.

Change-Id: Ifa3d597a14ed5c7a67a95cdec5bec194fa4687dd
Reviewed-on: https://gerrit.chromium.org/gerrit/35255
Reviewed-by: Darin Petkov <petkov@chromium.org>
Commit-Ready: Ben Chan <benchan@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
2 files changed