Short answer: No, it does not.
Long answer: The firmware does not support the deep sleep / hibernate functions yet.
We use the Open Source U-boot firmware, with Trusted Firmware - ARM integration.
And the Trusted Firmware - ARM integration does not yet support suspend/hibernation.
But we do hear from the TF-A developers from time to time and they are looking into it. So it might get into the next release of TF-A, which would be version 2.4.