dtc: Testcase for /include/ directive

This patch adds a testcase for the /include/ directive.  It assembles
a sample dts file with many /include/ directives at a variety of
different lexical / grammatical contexts.

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

tests/include0.dts

@@ -0,0 +1 @@
+/include/ "include1.dts"

tests/include1.dts

@@ -0,0 +1,23 @@
+/dts-v1/;
+
+/include/ "include2.dts"
+/memreserve/ /include/ "include3.dts";
+
+/ {
+	/include/ "include4.dts"
+	/include/ "include5.dts" = <0xdeadbeef>;
+	prop-str = /include/ "include6.dts";
+
+	/include/ "include7.dts"
+
+	subnode@2 {
+		linux,phandle = <0x2000>;
+		prop-int = <123456789>;
+
+		/include/ "include8.dts"
+			linux,phandle = <0x2001>;
+			compatible = "subsubnode2", "subsubnode";
+			prop-int = <0726746425>;
+		};
+	};
+};

tests/include2.dts

@@ -0,0 +1 @@
+/memreserve/ 0xdeadbeef00000000 0x100000;

tests/include3.dts

@@ -0,0 +1 @@
+123456789 010000

tests/include4.dts

@@ -0,0 +1 @@
+	compatible = "test_tree1";

tests/include5.dts

@@ -0,0 +1 @@
+prop-int

tests/include6.dts

@@ -0,0 +1 @@
+"hello world"

tests/include7.dts

@@ -0,0 +1,9 @@
+	subnode@1 {
+		compatible = "subnode1";
+		prop-int = [deadbeef];
+
+		subsubnode {
+			compatible = "subsubnode1", "subsubnode";
+			prop-int = <0xdeadbeef>;
+		};
+	};

tests/include8.dts

@@ -0,0 +1 @@
+subsubnode@0 {

tests/run_tests.sh

@@ -206,6 +206,10 @@ dtc_tests () {
     run_dtc_test -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 /include/ directive
+    run_dtc_test -I dts -O dtb -o includes.test.dtb include0.dts
+    run_test dtbs_equal_ordered includes.test.dtb test_tree1.dtb
+
     # Check /incbin/ directive
     run_dtc_test -I dts -O dtb -o incbin.test.dtb incbin.dts
     run_test incbin incbin.test.dtb