Flashrom update from Stefan, resolve issue 21

Corresponding to flashrom svn r34 and coreboot v2 svn r2111.
diff --git a/w49f002u.c b/w49f002u.c
index 02667cf..15df445 100644
--- a/w49f002u.c
+++ b/w49f002u.c
@@ -32,12 +32,12 @@
 #include "jedec.h"
 #include "w49f002u.h"
 
-int write_49f002(struct flashchip *flash, unsigned char *buf)
+int write_49f002(struct flashchip *flash, uint8_t *buf)
 {
 	int i;
 	int total_size = flash->total_size * 1024, page_size =
 		flash->page_size;
-	volatile char *bios = flash->virt_addr;
+	volatile uint8_t *bios = flash->virt_addr;
 
 	erase_chip_jedec(flash);