Revert "Merge tag 'dm-pull-20jul20' of git://git.denx.de/u-boot-dm"

This reverts commit 5d3a21df6694ebd66d5c34c9d62a26edc7456fc7, reversing
changes made to 56d37f1c564107e27d873181d838571b7d7860e7.

Unfortunately this is causing CI failures:
https://travis-ci.org/github/trini/u-boot/jobs/711313649

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/tools/fit_image.c b/tools/fit_image.c
index df310b5..a082d93 100644
--- a/tools/fit_image.c
+++ b/tools/fit_image.c
@@ -53,7 +53,7 @@
 	}
 
 	/* for first image creation, add a timestamp at offset 0 i.e., root  */
-	if (params->datafile || params->reset_timestamp) {
+	if (params->datafile) {
 		time_t time = imagetool_get_source_date(params->cmdname,
 							sbuf.st_mtime);
 		ret = fit_set_timestamp(ptr, 0, time);