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>
1 file changed