Make the dtc accept nodes as well as properties. This will allow 
include dts files to have nodes. 

This in turn allows: 
{
        device_operations = "w83627thg_ops";
        /* To override any of these, put the over-ride in mainboard dts. */

        /* COM1 */
        pnp@2{
	        com1dev = "2";
        	com1enable = "0";
        	com1io = "0x3f8";
        	com1irq = "4";
        };

Which currently does not work. 

We have not test override in the mainboard yet. 

Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>

Index: util/dtc/dtc-parser.y
===================================================================
--- util/dtc/dtc-parser.y	(revision 1013)
+++ util/dtc/dtc-parser.y	(working copy)
@@ -134,7 +134,7 @@
 				exit(1);
 			}
 			switchin(f);
-		}  '{' proplist '}' ';' {
+		}  '{' proplist subnodes '}' ';' {
 			void	switchback(void);
 			switchback();