Hi sunxi h6,
The TF-A project repository is no longer hosted on Github which is a readonly mirror of the git repository on trustedfirmware.org. The contribution guidelines under https://trustedfirmware-a.readthedocs.io/en/latest/process/contributing.html provide the guidance for working with the Gerrit code collaboration tool. Unfortunately we cannot process pull requests via Github.
I took the patch and put it into gerrit. Due to a lack of name or email address I used mine. Happy to change that once I learn about the real identity of "armlabs".