Using mat-typography w/ md-subheader inside md-list causes extra margin

[grizzm0]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

While using "mat-typography" globally components such as sub-header should not be affected

What is the current behavior?

Sub-header gets 16px margin-bottom.

What are the steps to reproduce?

https://plnkr.co/edit/xyn5CLEnh6yzLgxftXud?p=preview

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

Being able to use mat-typography globally.

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

Is there anything else we should know?

[angular-automatic-lock-bot]

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