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>
diff --git a/flashchips.c b/flashchips.c
index cac6c77..22e8a10 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -7813,7 +7813,7 @@
 		.page_size	= 256,
 		/* OTP: 506B total (2x 8B, 30x 16B, 1x 10B); read 0x4B; write 0x42 */
 		.feature_bits	= FEATURE_WRSR_WREN | FEATURE_OTP,
-		.tested		= TEST_UNTESTED,
+		.tested		= TEST_OK_PREW,
 		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,
 		.block_erasers	=