Add w49f002u support

Corresponding to coreboot v1 svn r643.
diff --git a/Makefile b/Makefile
index 18a6396..f4e2769 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,5 @@
-OBJS = jedec.o sst28sf040.o am29f040b.o mx29f002.c sst39sf020.o m29f400bt.o
+OBJS = jedec.o sst28sf040.o am29f040b.o mx29f002.c sst39sf020.o m29f400bt.o \
+	w49f002u.o
 OBJS += 82802ab.o
 CC = gcc -O2 -g