Flashrom update from Stefan, resolve issue 21

Corresponding to flashrom svn r34 and coreboot v2 svn r2111.
diff --git a/am29f040b.h b/am29f040b.h
index 08c6c92..99efb67 100644
--- a/am29f040b.h
+++ b/am29f040b.h
@@ -3,6 +3,6 @@
 
 extern int probe_29f040b(struct flashchip *flash);
 extern int erase_29f040b(struct flashchip *flash);
-extern int write_29f040b(struct flashchip *flash, unsigned char *buf);
+extern int write_29f040b(struct flashchip *flash, uint8_t *buf);
 
 #endif				/* !__AM29F040B_H__ */