Fix serious pointer bug with bootm and reserve map.

What was suppose to be a stack variable was declared as a pointer,
  overwriting random memory.
Also moved the libfdt.a requirement into the main Makefile.  That is
  The U-Boot Way.
diff --git a/Makefile b/Makefile
index 9a27bc2..94cda54 100644
--- a/Makefile
+++ b/Makefile
@@ -219,6 +219,7 @@
 LIBS += $(shell if [ -d post/board/$(BOARDDIR) ]; then echo \
 	"post/board/$(BOARDDIR)/libpost$(BOARD).a"; fi)
 LIBS += common/libcommon.a
+LIBS += libfdt/libfdt.a
 LIBS += $(BOARDLIBS)
 
 LIBS := $(addprefix $(obj),$(LIBS))