The buildUBoot function is intended for internal use and is dedicated
for Raspberry Pi platforms. With latest nixpkgs it is causing
build failure in older uboot(prior to v2023.07) due to a Raspberry Pi patch.
Now this function is not used for the U-Boot build.
More Information:
https://github.com/NixOS/nixpkgs/pull/311614https://github.com/NixOS/nixpkgs/pull/146634
Signed-off-by: Ganga Ram <Ganga.Ram@tii.ae>