common: Drop image.h from common header

Move this uncommon header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c
index c189bdc..68beea2 100644
--- a/arch/arm/lib/bootm.c
+++ b/arch/arm/lib/bootm.c
@@ -17,6 +17,7 @@
 #include <cpu_func.h>
 #include <dm.h>
 #include <hang.h>
+#include <lmb.h>
 #include <dm/root.h>
 #include <env.h>
 #include <image.h>