test: Mark all driver model tests with a flag

Add a flag for driver model tests, so we can do special processing for
them.

Signed-off-by: Simon Glass <sjg@chromium.org>

include/dm/test.h

@@ -143,7 +143,8 @@ struct dm_test_state {
 };
 
 /* Declare a new driver model test */
-#define DM_TEST(_name, _flags)	UNIT_TEST(_name, _flags, dm_test)
+#define DM_TEST(_name, _flags) \
+	UNIT_TEST(_name, UT_TESTF_DM | (_flags), dm_test)
 
 /*
  * struct sandbox_sdl_plat - Platform data for the SDL video driver

include/test/test.h

@@ -36,6 +36,8 @@ enum {
 	UT_TESTF_FLAT_TREE	= BIT(3),	/* test needs flat DT */
 	UT_TESTF_LIVE_TREE	= BIT(4),	/* needs live device tree */
 	UT_TESTF_CONSOLE_REC	= BIT(5),	/* needs console recording */
+	/* do extra driver model init and uninit */
+	UT_TESTF_DM		= BIT(6),
 };
 
 /**