writeprotect: finish the w25x40 table This adds a few missing entries to the writeprotect table for the Winbond W25X40. I could only find two variants of the chip, -CV and -CL, both of which had a compatible range of protect bits. BUG=none BRANCH=none TEST=none Change-Id: Ifa630e537be5667ee30086cc2f1a343e704abf4c Signed-off-by: David Hendricks <dhendrix@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/353810 Reviewed-by: Souvik Ghosh <souvikghosh@google.com>