Update packaging descriptions
fixes
E: kgx: extended-description-is-empty
from https://arm01.puri.sm/job/debs/job/deb-kgx-buster-aarch64/1/console
fixes
E: kgx: extended-description-is-empty
from https://arm01.puri.sm/job/debs/job/deb-kgx-buster-aarch64/1/console