Simon Glass <sjg@chromium.org> says:
Commit bd3f9ee679 added FORCE to several if_changed rules whose
recipes expand $^, so FORCE leaks in as a stray argument and the
command fails. Use $< to restore the Edison and i.MX23/28 images.
Link: https://lore.kernel.org/r/20260613130519.1516808-1-sjg@chromium.org