Revert "annotations: add positions"

This reverts commit baa1d2cf78.

Turns out this introduced memory badness.  valgrind picks it up on
x86, but it straight out SEGVs on x86.

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

flattree.c

@@ -692,7 +692,7 @@ static struct property *flat_read_property(struct inbuf *dtbuf,
 
 	val = flat_read_data(dtbuf, proplen);
 
-	return build_property(name, val, NULL);
+	return build_property(name, val);
 }
 
 
@@ -750,7 +750,7 @@ static struct node *unflatten_tree(struct inbuf *dtbuf,
 	char *flatname;
 	uint32_t val;
 
-	node = build_node(NULL, NULL, NULL);
+	node = build_node(NULL, NULL);
 
 	flatname = flat_read_string(dtbuf);