common: Drop image.h from common header

Move this uncommon header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>

test/compression.c

@@ -7,6 +7,7 @@
 #include <bootm.h>
 #include <command.h>
 #include <gzip.h>
+#include <image.h>
 #include <lz4.h>
 #include <malloc.h>
 #include <mapmem.h>