flashchips.c: add CMP bit entry to W25Q256.V

Add bit that was missed in `commit a850fd0a`

Change-Id: I1cb400f6b8542a9054875b8f2557db1cc06292e2
Signed-off-by: Nikolai Artemiev <nartemiev@google.com>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/64607
Original-Reviewed-by: Nico Huber <nico.h@gmx.de>
Original-Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
diff --git a/flashchips.c b/flashchips.c
index 408a43f..b42ba2a 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -17316,6 +17316,7 @@
 			.srl    = {STATUS2, 0, RW},
 			.bp     = {{STATUS1, 2, RW}, {STATUS1, 3, RW}, {STATUS1, 4, RW}, {STATUS1, 5, RW}},
 			.tb     = {STATUS1, 6, RW},
+			.cmp    = {STATUS2, 6, RW},
 		},
 		.decode_range	= decode_range_spi25,
 	},