Adds support for ST M29W512B

Tested and works for me.

Corresponding to flashrom svn r888.

Signed-off-by: Jeffrey A. Kent <jakent@gmail.com>
Acked-by: Sean Nelson <audiohacked@gmail.com>
diff --git a/flashchips.h b/flashchips.h
index 7f9c8a2..e299852 100644
--- a/flashchips.h
+++ b/flashchips.h
@@ -473,6 +473,7 @@
 #define ST_M29F800DT		0xEC
 #define ST_M29W010B		0x23
 #define ST_M29W040B		0xE3
+#define ST_M29W512B		0x27
 
 #define SYNCMOS_ID		0x40	/* SyncMOS and Mosel Vitelic */
 #define S29C51001T		0x01