Put seccomp policy files in a common directory

We will almost certainly require different seccomp policy files for
different architectures.  Move all the existing secommp policy files
into a common directory grouped by architecture.

This will make it easier to install them via the ebuild later.

BUG=none
TEST=none

Change-Id: I0495789cd4143dc374ee6ebe083dc20ce724edbb
Signed-off-by: Chirantan Ekbote <chirantan@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/630058
Reviewed-by: Zach Reizner <zachr@chromium.org>
Reviewed-by: Dylan Reid <dgreid@chromium.org>

seccomp/x86_64/block_device.policy

@@ -1,3 +1,7 @@
+# Copyright 2017 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
 close: 1
 exit_group: 1
 futex: 1

seccomp/x86_64/net_device.policy

@@ -1,3 +1,7 @@
+# Copyright 2017 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
 close: 1
 exit_group: 1
 futex: 1

seccomp/x86_64/rng_device.policy

@@ -1,3 +1,7 @@
+# Copyright 2017 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
 close: 1
 exit_group: 1
 futex: 1

seccomp/x86_64/vhost_net_device.policy

@@ -1,3 +1,7 @@
+# Copyright 2017 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
 close: 1
 exit_group: 1
 futex: 1