Input placeholder is read by the NVDA reader twice

[JMB02]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

The NVDA reader should only read the input field name once, for example:
1. Field name
2. Filed type
3. Filed content

What is the current behavior?

The NVDA reader reads the field name twice:
1. Field name
2. Filed type
3. Field name
4. Filed content

What are the steps to reproduce?

1. Go to https://stackblitz.com/angular/yjpykykdxpag
2. Run NVDA reader (default settings)
3. Click on empty input, for example 'City'

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

Is there anything else we should know?

The problem is probably caused by the fact that the component contains in html the placeholder tag and internal label, which are both read by the NVDA reader.