bug(mat-select): Voiceover voices "space" before the label of mat-select

[dwaynelavon]

Reproduction

Stackblitz: https://stackblitz.com/edit/angular-8tw5ym?file=src/app/select-hint-error-example.html

Steps to reproduce:

1. Activate Voiceover
2. Visit Stackblitz link
3. Tab to the mat-select
4. Observe Voiceover voicing.

Expected Behavior

What behavior were you expecting to see?
Voiceover should voice the mat-label

Actual Behavior

What behavior did you actually see?
Voiceover voices "space" before it voices the mat-label. In chrome dev tools, you can see a &nbsp inside of the .mat-placeholder.

Environment

• Angular: 11.0.3
• CDK/Material: 11.0.3
• Browser(s): Chrome
• Operating System (e.g. Windows, macOS, Ubuntu): Mac

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