test: Drop the function for running dm tests

Use the new suite-runner to run these tests instead.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/cmd_ut.c b/test/cmd_ut.c
index 1fda67a..a0905ec 100644
--- a/test/cmd_ut.c
+++ b/test/cmd_ut.c
@@ -133,7 +133,7 @@
 #endif
 	SUITE(common),
 #if defined(CONFIG_UT_DM)
-	SUITE_CMD(dm, do_ut_dm),
+	SUITE(dm),
 #endif
 #if defined(CONFIG_UT_ENV)
 	SUITE_CMD(env, do_ut_env),