programmer_init: use struct programmer_entry*

Change-Id: Iacf0f25abc94a84c5d52c8d69a3e8640817b060a
Signed-off-by: Thomas Heijligen <thomas.heijligen@secunet.de>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/55121
Original-Reviewed-by: Nico Huber <nico.h@gmx.de>
4 files changed