flashchips: Mark AMIC A25L40PU as tested

As per Stefan Szwarnowski on the mailing list.

Change-Id: I574094bdb83611a3cda2fcc455bcf9aed3774011
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/28818
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/flashchips.c b/flashchips.c
index 7a19054..a70d953 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -871,7 +871,7 @@
 		.total_size	= 512,
 		.page_size	= 256,
 		.feature_bits	= FEATURE_WRSR_WREN,
-		.tested		= TEST_OK_PR,
+		.tested		= TEST_OK_PREW,
 		.probe		= probe_spi_rdid4,
 		.probe_timing	= TIMING_ZERO,
 		.block_erasers	=