mkimage: Add a quiet mode

Some build systems want to be quiet unless there is a problem. At present
mkimage displays quite a bit of information when generating a FIT file. Add
a '-q' flag to silence this.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

tools/imagetool.c

@@ -51,7 +51,8 @@ int imagetool_verify_print_header(
 				 * successful
 				 */
 				if ((*curr)->print_header) {
-					(*curr)->print_header(ptr);
+					if (!params->quiet)
+						(*curr)->print_header(ptr);
 				} else {
 					fprintf(stderr,
 						"%s: print_header undefined for %s\n",