The prerequisite for mounting this attack is kernel code execution already [0]:

> We show that a malicious kernel driver ...

As per [1] the Power management unit is shared between the Application Processor (AP) and the Secure Enclave Processor (SEP) so this attack might work against iPhones as well.

[0] https://www.usenix.org/conference/usenixsecurity17/technical... [1] https://www.blackhat.com/docs/us-16/materials/us-16-Mandt-De...