* Add gxl blobs
As found following directions at https://github.com/BayLibre/u-boot
For building mainline u-boot without cloning entire vendor tree.
* add missed file
* import from vendor
* add executable bits
* add executable bits
* Create readme.txt
document where the blobs come from
* NanoPi K2 blobs
* Add aml-user-key.sig
Add the key found in board/amlogic/gxb_nanopi_k2/aml-user-key.sig
* Revert "Add aml-user-key.sig"
This reverts commit bf437130b4.
File not needed, u-boot.bin.sd.bin was not being
generated due to a scripting error.