flashchips: Mark W25Q256JV_Q as tested

Mark probe, read, erase and write tested for W25Q256JV_Q. As reported in
https://mail.sourcearcade.org/hyperkitty/list/flashprog@flashprog.org/thread/3HRWA76VCCW5S54KLUBJW3HGFFHPQLK6/

Change-Id: Ia7526263dea5ddd692eb5d485c5919af1784c7d2
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reported-by: Mathieu Pilato <pilatomic@gmail.com>
Reviewed-on: https://review.sourcearcade.org/c/flashprog/+/41
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/flashchips.c b/flashchips.c
index 4f5b3eb..dfce11d 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -17684,7 +17684,7 @@
 		/* supports SFDP */
 		/* OTP: 1024B total, 256B reserved; read 0x48; write 0x42, erase 0x44, read ID 0x4B */
 		.feature_bits	= FEATURE_WRSR_WREN | FEATURE_OTP | FEATURE_4BA | FEATURE_WRSR2,
-		.tested		= TEST_UNTESTED,
+		.tested		= TEST_OK_PREW,
 		.probe		= probe_spi_rdid,
 		.probe_timing	= TIMING_ZERO,
 		.block_erasers	=