These files all contain functions whose prototypes are in header files,
so make sure those header files are included.

Change-Id: I0189a1550bf90d4a0b87dcef9f8a8449590cc9d7
Signed-off-by: Jacob Garber <jgarber1@ualberta.ca>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/33668


Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>