Report decoded CINR and RSSI values for Device interface.

BUG=chrome-os-partner:10005
TEST=Observe updates of CINR and RSSI in Device properties over DBus.

Change-Id: Ieac3809fa64eda9c232c4cf010657d12c4ad0982
Reviewed-on: https://gerrit.chromium.org/gerrit/24349
Reviewed-by: Darin Petkov <petkov@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
Commit-Ready: Ben Chan <benchan@chromium.org>
4 files changed