Comment 2 for bug 848782

If this is still relevant, I'm not sure flash-kernel is the right place for it anymore:

The flash-kernel-installer package isn't produced (as we don't produce udebs anymore), and generally speaking, flash-kernel has little to do with whatever appears on the boot partition in images. For instance, in the case of the pi images, that's down to the gadget snap (although ideally, the gadget snap would be calling something in flash-kernel to produce that output, but that's not the case currently).