test: dm: Move the dm tests over to the ut command

Unify the command for running unit tests further by moving the "dm test"
command over to "ut dm".

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/test/dm/Kconfig b/test/dm/Kconfig
index 3ca154f..0fa3074 100644
--- a/test/dm/Kconfig
+++ b/test/dm/Kconfig
@@ -1,9 +1,9 @@
-config DM_TEST
-	bool "Enable driver model test command"
-	depends on SANDBOX && CMD_DM
+config UT_DM
+	bool "Enable driver model unit test command"
+	depends on SANDBOX
 	select UNIT_TEST
 	help
-	  This enables the 'dm test' command which runs a series of unit
+	  This enables the 'ut dm' command which runs a series of unit
 	  tests on the driver model code. Each subsystem (uclass) is tested.
 	  If all is well then all tests pass although there will be a few
 	  messages printed along the way.