Explicitly mark DrmObject as non-copyable
It implicitly already is not copyable, due to the unique_ptr member. However, Qt6 moc code isn't realizing that and fails to compile the DrmPlane Q_GADGET sub-class of this.
It implicitly already is not copyable, due to the unique_ptr member. However, Qt6 moc code isn't realizing that and fails to compile the DrmPlane Q_GADGET sub-class of this.