Add icon to entity registry list for display

[frenck]

Proposed change

To help frontend with display entities that have a different icon set in the entity registry, this PR extends the lists for display with the icon property.

Right now, the frontend has to retrieve the entity from the registry for just display purposes (which was the whole goal of this call in the first place).

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
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• Tests have been added to verify that the new code works.

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[home-assistant]

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