IATF has no additional requirements regarding the Quality Policy compared to ISO 9001:2015. If you already implemented ISO 9001:2015, you can use the same policy for both standards.
If you are developing it from scratch, the policy must meet following requirements:
- it must be appropriate to the purpose and context of the organization and supports its strategic direction;
- it must provide a framework for setting quality objectives;
- it must include a commitment to satisfy applicable requirements;
- it must include a commitment to continual improvement of the quality management system.