common/cmd_elf.c: add missing include

Signed-off-by: Jeroen Hofstee <jeroen@myspectrum.nl>
[trini: bootm.h must come after common.h]
Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/common/cmd_elf.c b/common/cmd_elf.c
index 2f229d7..42a5296 100644
--- a/common/cmd_elf.c
+++ b/common/cmd_elf.c
@@ -14,6 +14,7 @@
  */
 
 #include <common.h>
+#include <bootm.h>
 #include <command.h>
 #include <linux/ctype.h>
 #include <net.h>