Add support for Winbond W25Q40.V chips.

Read-tested by Peter Ruesch.

Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>

git-svn-id: svn://flashrom.org/flashrom/trunk@1850 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1