Fix invalid property during test_technology_check_property
test_technology_check_property
fails with:
bin/connman-test.sh: 71: Invalid property TetheringFreq: not found
ConnMan adds a new property to its Technologies.
https://phabricator.apertis.org/T8599
Signed-off-by: Frédéric Danis frederic.danis@collabora.com