flashchips: Mark PMC Pm25LD020 as tested

As per `The_Raven Raven` on the mailing list.

Change-Id: I16d5a207599b434fe52b42709e42f1f32a8e6698
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/28820
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 45a392f..4337fba 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -10809,7 +10809,7 @@
 		.total_size	= 256,
 		.page_size	= 256,
 		.feature_bits	= FEATURE_WRSR_WREN,
-		.tested		= TEST_UNTESTED,
+		.tested		= TEST_OK_PREW,
 		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,
 		.block_erasers	=