Add a u-boot-master child port which builds u-boot for the Solid-Run GT 8K.
It has an optional patch to make all 3 mPCIe slots do PCIe instead of PCIe/SATA (Storage)/USB (LTE).
I have a follow-up port (to cleanup still) which will build ATF for the gt8k based on atf-master (which will come once this is sorted).
This should then also allow anyone to build similar for the mchbin should they desire.
Created attachment 224085 [details]
This time actually upload the diff as well.