flashchips: Mark W25Q128.W as tested

Tested read, erase, and write using W25Q128FWSIG and Dediprog SF600.

Change-Id: Id0ef331ad3b3a8ab05a9472f3053f76c0789b1f9
Signed-off-by: David Hendricks <dhendricks@fb.com>
Reviewed-on: https://review.coreboot.org/22790
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/flashchips.c b/flashchips.c
index a33b37e..749e96e 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -15054,7 +15054,7 @@
 		/* supports SFDP */
 		/* OTP: 1024B total, 256B reserved; read 0x48; write 0x42, erase 0x44, read ID 0x4B */
 		.feature_bits	= FEATURE_WRSR_WREN | FEATURE_OTP | FEATURE_QPI,
-		.tested		= TEST_UNTESTED,
+		.tested		= TEST_OK_PREW,
 		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,
 		.block_erasers	=