Start of work on passing around StrictMode policy over Binder calls.

This is (intendend to be) a no-op change.

At this stage, Binder RPCs just have an additional uint32 passed around
in the header, right before the interface name.  But nothing is actually
done with them yet.  That value should right now always be 0.

This now boots and seems to work.

Change-Id: I135b7c84f07575e6b9717fef2424d301a450df7b
diff --git a/cmds/servicemanager/bctest.c b/cmds/servicemanager/bctest.c
index 6dee816..ff5aced 100644
--- a/cmds/servicemanager/bctest.c
+++ b/cmds/servicemanager/bctest.c
@@ -14,6 +14,7 @@
     struct binder_io msg, reply;
 
     bio_init(&msg, iodata, sizeof(iodata), 4);
+    bio_put_uint32(&msg, 0);  // strict mode header
     bio_put_string16_x(&msg, SVC_MGR_NAME);
     bio_put_string16_x(&msg, name);
 
@@ -37,7 +38,7 @@
     struct binder_io msg, reply;
 
     bio_init(&msg, iodata, sizeof(iodata), 4);
-
+    bio_put_uint32(&msg, 0);  // strict mode header
     bio_put_string16_x(&msg, SVC_MGR_NAME);
     bio_put_string16_x(&msg, name);
     bio_put_obj(&msg, ptr);