Make platform setup a coroutine

[fredrike]

Description:

Make platform setup a coroutine.

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• New dependencies have been added to the REQUIREMENTS variable (example).
• New dependencies are only imported inside functions that use them (example).
• New or updated dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.
• New files were added to .coveragerc.

If the code does not interact with devices:

• Tests have been added to verify that the new code works.

[fredrike]

According to @MartinHjelmare's comment #22417 (comment)

[pvizeli]

Make sure you have no IO on initial process for them

[fredrike]

Make sure you have no IO on initial process for them

All of them are deprecated and are just there for backwards compatibilities (pass).

I don't know how long they are supposed to be there though (both Daikin and Telldus Live are configured via the Config flow).

[MartinHjelmare]

Until the EntityPlatform helper is made to handle platforms without this function, we need to keep it around.

[MartinHjelmare]

Can be merged when build passes.