Add W25Q...W series.

 - Use ".V" (and "_V" in macros) for 3.3V Winbond 25Q chips.
   Rename the existing chips and add a .voltage entry where it was missing.
 - Use ".W" (and "_W" in macros) for 1.8V Winbond 25Q chips.
 - Add W25Q20.W, W25Q40.W, W25Q80.W, W25Q16.W, W25Q32.W, W25Q64.W.
 Based on chromiumos' 469707f0d9b7d81b6c6bb2cace13f09db70f4382
 http://git.chromium.org/gitweb/?p=chromiumos/third_party/flashrom.git;a=commitdiff;h=469707f0d9b7d81b6c6bb2cace13f09db70f4382

Signed-off-by: Yung-Chieh Lo <yjlou%chromium.org@gtempaccount.com>
Signed-off-by: Stefan Tauner <stefan.tauner@student.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@student.tuwien.ac.at>

git-svn-id: svn://flashrom.org/flashrom/trunk@1677 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1