flashchips: Mark Intel 25F640S33B8 as TESTED_PREW

Tested with ch341a_spi from an Atheros AP81 reference board.

Change-Id: I67b5962a1ae26fd1bc7e3889f1616def28b599ef
Signed-off-by: Zoltan HERPAI <wigyori@uid0.hu>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/44342
Original-Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/70941
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Nico Huber <nico.h@gmx.de>
1 file changed