* Option to restrict automatic updates to bootloader and/or vl805
* Change the machine mode output variables
* recovery.bin: Rebuild from Gitlab
* Rename CURRENT_TS and LATEST_TS in machine output
* New beta recovery.bin which can update the VLI EEPROM before
start.elf is loaded. This is the recommended and default method
because no USB devices will be in use at this stage.
* Extend the USE_FLASHROM configuration to use the vl805 tool
to program the VL805 directly.
* Generate SHA256 checksums in .sig files for the bootloader and
and VL805 images. This is required by the new recovery.bin to
guard against corrupted files being flashed to the EEPROM(s).
* Various variable renames to distinguish between the bootloader
and the VL805 images.
Select the recovery.bin to use according to FIRMWARE_RELEASE_STATUS
in order to allow a beta test version of recovery.bin to be provided
without risking breaking the stable version of recovery.bin
