*cdkDragPreview directive is not updating when parent has ChangeDetectionStrategy.OnPush

[m-bobrowicz]

Bug, feature request, or proposal:

Bug (or proposal)

What is the expected behavior?

*cdkDragPreview should update with OnPush change detection strategy (or there should be a note about this in the docs)

What is the current behavior?

*cdkDragPreview directive is not updating when parent has OnPush change detection strategy.

What are the steps to reproduce?

https://stackblitz.com/edit/angular-pwtsl2?file=app/cdk-drag-drop-custom-preview-example.ts

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

@angular/cdk: 7.0.2
Typescript: 3.1.3
Chrome: Version 70.0.3538.77 (Official Build) (64-bit)
Ubuntu 18.04

[crisbeto]

Will be fixed by #13703.

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