package/dt-utils: use snapshot tarball

Use snapshot tarball so DT_UTILS_VERSION will match what is returned by
https://release-monitoring.org

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/dt-utils/dt-utils.hash

@@ -1,3 +1,3 @@
 # Locally computed
-sha256  8b29d3a8799170afdb1b077e655528bf4e6afe0c789107b1eec8fff9d4482771  dt-utils-v2021.03.0-br1.tar.gz
+sha256  63cf47c70911bb3605bafac38a5a7e19eb753ac1c90de2abceaf2fdefd71be6d  dt-utils-2021.03.0.tar.xz
 sha256  a45932c79317d15116eadbf1c9c6fc59117ec3c4621db3a876066defa723963b  COPYING

package/dt-utils/dt-utils.mk

@@ -4,9 +4,9 @@
 #
 ################################################################################
 
-DT_UTILS_VERSION = v2021.03.0
-DT_UTILS_SITE = https://git.pengutronix.de/git/tools/dt-utils
-DT_UTILS_SITE_METHOD = git
+DT_UTILS_VERSION = 2021.03.0
+DT_UTILS_SOURCE = dt-utils-$(DT_UTILS_VERSION).tar.xz
+DT_UTILS_SITE = https://git.pengutronix.de/cgit/tools/dt-utils/snapshot
 DT_UTILS_LICENSE = GPL-2.0
 DT_UTILS_LICENSE_FILES = COPYING
 DT_UTILS_DEPENDENCIES = udev