D7711: Add missing imports for attached properties

[David Edmundson]

davidedmundson accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R858 Qt Quick Controls 2: Desktop Style

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D7711

To: apol, #frameworks, mart, davidedmundson
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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