To use the generated json file in the json-fwr tooling, it helps to fill
the name.

On i.MX6 devices, the U-Boot file types are not set at all. Extent check for
the existance of the uboot_file_types var.

With the free open source plan, sourcery works only when called from the
repository's root directory. Re-enable it by calling it from there.

Also apply sourcery's suggestions to file generate_firmware_package.py,
which did not exist before disabling sourcery.

The old Alphaplan stage is deprecated and was removed in a prior commit.
Add new stage to generate the Firmware Package JSON files that do replace
the old Alphaplan articles.