flashchips.c: Mark W25Q40EW as TESTED_PREW

Mark Winbond W25Q40EW as TESTED_PREW.

The Winbond W25Q40EW has been marked TESTED_PREW in the ChromiumOS
repository. ChromiumOS has the same defintion for this chip as this
repo, except that ChromiumOS does not have FEATURE_OTP.

Signed-off-by: Alan Green <avg@google.com>
Change-Id: I4be5b2e1069a3f735f0dc6ec92d5f4c8946fbb02
Reviewed-on: https://review.coreboot.org/c/flashrom/+/35535
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
diff --git a/flashchips.c b/flashchips.c
index e6215a0..8baa2ee 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -16230,7 +16230,7 @@
 		.page_size	= 256,
 		/* OTP: 3*256B total; read 0x48; write 0x42, erase 0x44, read ID 0x4B */
 		.feature_bits	= FEATURE_WRSR_WREN | FEATURE_OTP,
-		.tested		= TEST_UNTESTED,
+		.tested		= TEST_OK_PREW,
 		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,
 		.block_erasers	=