fix: make hwdata truly a runtime dependency

Summary: Followup to comments in D10041

Reviewers: #plasma, ngraham, davidedmundson, zzag

Reviewed By: #plasma, ngraham, davidedmundson, zzag

Subscribers: iasensio, wstephenson, davidedmundson, zzag, ngraham, kwin, cgiboudeaux

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D27729