Change FRU ID of system to match that of node

Because hostboot doesn't send down separate FRU data
for node vs system, they need to have the same FRU ID
so the BMC knows where to put the chassis data that
comes downs with the node data.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>

witherspoon.xml

@@ -2300,7 +2300,7 @@
 	<id>/sys-0</id>
 	<property>
 	<id>FRU_ID</id>
-	<value>0</value>
+	<value>3</value>
 	</property>
 	<property>
 	<id>IPMI_INSTANCE</id>