Split general policy into public and private components.

Divide policy into public and private components.  This is the first
step in splitting the policy creation for platform and non-platform
policies.  The policy in the public directory will be exported for use
in non-platform policy creation.  Backwards compatibility with it will
be achieved by converting the exported policy into attribute-based
policy when included as part of the non-platform policy and a mapping
file will be maintained to be included with the platform policy that
maps exported attributes of previous versions to the current platform
version.

Eventually we would like to create a clear interface between the
platform and non-platform device components so that the exported policy,
and the need for attributes is minimal.  For now, almost all types and
avrules are left in public.

Test: Tested by building policy and running on device.

Change-Id: Idef796c9ec169259787c3f9d8f423edf4ce27f8c
diff --git a/private/kernel.te b/private/kernel.te
new file mode 100644
index 0000000..1c2223e
--- /dev/null
+++ b/private/kernel.te
@@ -0,0 +1,3 @@
+# type_transition must be private policy the domain_trans rules could stay
+# public, but conceptually should go with this
+domain_auto_trans(kernel, init_exec, init)