Drop base ATTR constants in zeroconf

[epenet]

Breaking change

Not a breaking change if this is merged before 2021.12

Proposed change

Drop zeroconf constants created in #58671 and #58835.
Since ZeroconfServiceInfo was migrated to a dataclass, these should no longer be required.

Type of change

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

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[probot-home-assistant]

Hey there @bdraco, mind taking a look at this pull request as it has been labeled with an integration (zeroconf) you are listed as a code owner for? Thanks!
_{^{(message by CodeOwnersMention)}}

[epenet]

In order to ensure can be merged before beta cut-off I have included lutron_caseta, samsungtv and xiaomi_miio

[epenet]

Phew this now passes.
@bdraco / @frenck could we merge this?

[frenck]

Yes, this looks good, thanks @epenet 👍