There is an updated pull request by CameronNemo against master on the void-packages repository

https://github.com/CameronNemo/void-packages atf-rk3399-bl31
https://github.com/void-linux/void-packages/pull/21199

Pinebook Pro U-Boot: update to 2020.10, TF-A 2.3
@renatoaguiar care to give this a spin?

A patch file from https://github.com/void-linux/void-packages/pull/21199.patch is attached