Add support for ST M29F400BT - part 1

Corresponding to coreboot v1 svn r582.
diff --git a/Makefile b/Makefile
index bfa28df..15a2ae6 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-OBJS = jedec.o sst28sf040.o am29f040b.o mx29f002.c sst39sf020.o
+OBJS = jedec.o sst28sf040.o am29f040b.o mx29f002.c sst39sf020.o m29f400bt.o
 CC = gcc -O2 -g
 
 all: ${OBJS}