dtc: Fold comment handling test into testsuite

For ages dtc has included a sample dts, comment-test.dts, for checking
various lexical corner cases in comment processing.  In fact, it
predates the automated testsuite, and has never been integrated into
it.  This patch addresses this oversight, folding the comment handling
test in with the rest of the testsuite.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

tests/comments-cmp.dts

@@ -0,0 +1,16 @@
+/dts-v1/;
+
+/ {
+	prop1;
+	prop2;
+	prop3;
+	prop4;
+	prop5;
+	prop6;
+	prop7;
+	prop8;
+	prop9;
+	prop10;
+	child {
+	};
+};

tests/comments.dts

@@ -1,5 +1,6 @@
 /* regexps for lexing comments are.. tricky.  Check if we've actually
  * got it right */
+/dts-v1/;
 
 / {
 	// line comment

tests/run_tests.sh

@@ -154,6 +154,10 @@ dtc_tests () {
     run_test dtc.sh -I dts -O dtb -o dtc_path-references.test.dtb path-references.dts
     run_test path-references dtc_path-references.test.dtb
 
+    run_test dtc.sh -I dts -O dtb -o dtc_comments.test.dtb comments.dts
+    run_test dtc.sh -I dts -O dtb -o dtc_comments-cmp.test.dtb comments-cmp.dts
+    run_test dtbs_equal_ordered dtc_comments.test.dtb dtc_comments-cmp.test.dtb
+
     # Check -Odts mode preserve all dtb information
     for tree in test_tree1.dtb dtc_tree1.test.dtb dtc_escapes.test.dtb ; do
 	run_test dtc.sh -I dtb -O dts -o odts_$tree.test.dts $tree