Correct the spelling of *firmware* in a comment.
Change-Id: I44bcd95f754ff839d582dc2150e1883a6315da9e
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: https://review.coreboot.org/15078
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>