test: Fix SPL tests not being run

SPL doesn't have OF_LIVE enabled, so we can only run tests with a flat
tree. Don't skip them even if they don't use the devicetree.

Fixes: 6ec5178c0e ("test: Skip flat-tree tests if devicetree is not used")
Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

test/test-main.c

@@ -476,7 +476,8 @@ static int ut_run_test_live_flat(struct unit_test_state *uts,
 	 *   (for sandbox we handle this by copying the tree, but not for other
 	 *    boards)
 	 */
-	if ((test->flags & UT_TESTF_SCAN_FDT) &&
+	if ((!CONFIG_IS_ENABLED(OF_LIVE) ||
+	     (test->flags & UT_TESTF_SCAN_FDT)) &&
 	    !(test->flags & UT_TESTF_LIVE_TREE) &&
 	    (CONFIG_IS_ENABLED(OFNODE_MULTI_TREE) ||
 	     !(test->flags & UT_TESTF_OTHER_FDT)) &&