field_attach_validate not called for some farmOs entities

Problem/Motivation

It seems that some of the farmOs entities are not calling the entity form validation workflow, so stuff such as hook_field_attach_validate() is not run for farm_assets and probably plans and logs

Steps to reproduce

The simplest way is to add the https://www.drupal.org/project/field_validation module, install it (and the field validation ui) and create a validation rule for any field in these entities.

Proposed resolution

Add the logic to validate the relevant entities, as we're wrapping up the entity form, it might need some logic to extract the entity out.