dtoc: Increase code coverage to 100%

Add more tests to increase dtoc code coverage to 100%.

Correct a whitespace error in some test .dts files at the same time.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/dtoc/dtoc_test_addr32_64.dts b/tools/dtoc/dtoc_test_addr32_64.dts
index 7891ee5..7599d5b 100644
--- a/tools/dtoc/dtoc_test_addr32_64.dts
+++ b/tools/dtoc/dtoc_test_addr32_64.dts
@@ -5,7 +5,7 @@
  * Copyright 2017 Google, Inc
  */
 
- /dts-v1/;
+/dts-v1/;
 
 / {
 	#address-cells = <1>;