mat-list-option does not select mat-list-avatar

[Barbiero]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

When adding a matListAvatar image to a mat-list-option, the image should be positioned to the left of the option in same way as it does with mat-list-item

What is the current behavior?

matListAvatar is ignored altogether.

What are the steps to reproduce?

This stackblitz illustrates what I mean:
https://stackblitz.com/edit/angular-material2-issue-cgszmk

What is the use-case or motivation for changing an existing behavior?

Having lists with selection boxes and avatars. My use-case, specifically, is a "quiz"-type system; Other would be selecting users for sharing content, for instance.

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

Angular 5.2.6 Material 5.2.3

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