dm: core: Call dm_scan_other() when setting up for tests

At present this function is not called, so tests miss out on any devices
created by it. Add it in so that tests can rely on these extra devices.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/test-main.c b/test/test-main.c
index c0d0378..31837e5 100644
--- a/test/test-main.c
+++ b/test/test-main.c
@@ -228,8 +228,10 @@
 
 	uts->start = mallinfo();
 
-	if (test->flags & UT_TESTF_SCAN_PDATA)
+	if (test->flags & UT_TESTF_SCAN_PDATA) {
 		ut_assertok(dm_scan_plat(false));
+		ut_assertok(dm_scan_other(false));
+	}
 
 	if (test->flags & UT_TESTF_PROBE_TEST)
 		ut_assertok(do_autoprobe(uts));