doc: drivers: deprecate driver init levels

[nguyenmthien]

Remove deprecated driver initialization levels in the docs.

[nashif]

Those levels are not deprecated.

[nguyenmthien]

Those levels are not deprecated.

Those are deprecated in this commit

[nashif]

Those are deprecated in this commit

initialization of devices in this level is deprecated, not the init level itself.

[nguyenmthien]

Those are deprecated in this commit

initialization of devices in this level is deprecated, not the init level itself.

This file is the documentation for the device driver model, and not the init system as a whole right?

[nashif]

This file is the documentation for the device driver model, and not the init system as a whole right?

afaik this is the only place init levels are documented in the docs.

[nguyenmthien]

This file is the documentation for the device driver model, and not the init system as a whole right?

afaik this is the only place init levels are documented in the docs.

The wording of the removed sentences and the page title make it clear that this content is meant for device drivers only. IMO, the lack of documentation for SYS_INIT() does not constitute the necessity of including deprecated APIs in driver inits.

[gmarull]

considering this is a page dedicated to drivers, changes make sense. SYS_INIT Doxygen documents init levels in detail https://docs.zephyrproject.org/latest/doxygen/html/group__sys__init.html