dt-utils: fix hash

Hash has been reported as wrong by autobuilder since August 16th
Perhaps, it was wrong since bump to v2018.05.0 on August 9th

Fixes:
 - http://autobuild.buildroot.org/results/c6c8ede30623cc20011916cc95dbdae34dcc0344

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Reviewed-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Tested-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/dt-utils/dt-utils.hash

@@ -1,3 +1,3 @@
 # Locally computed
-sha256 a3aae73da39fd46775de390b7babafb63767082da10870c01b6595c4c9762af6  dt-utils-v2018.05.0.tar.gz
+sha256 d0f53c76bc9f821a6506c8db3b623922d82570a017a9a40ad118bd7c957672b6  dt-utils-v2018.05.0.tar.gz
 sha256 a45932c79317d15116eadbf1c9c6fc59117ec3c4621db3a876066defa723963b  COPYING