arc: bluetooth: Implement socket opening

arc: bluetooth: Implement socket opening

We cannot open BT sockets in side the container due to linux
kernel disallowing socket() calls to BT subsystem in a net
namespace. We avoid this by tunneling the actual socket()
call to outside the container thusly.

BUG=644494
Review-Url: https://codereview.chromium.org/2166143002
Cr-Commit-Position: refs/heads/master@{#406951}
(cherry picked from commit f6ef3d8451163369bd5c8b0846b68edf75cb0c74)

[Rahul Chaturvedi, 2016-09-07 23:47:28]

Committed patchset #1 (id:1) to pending queue manually as
2756f02e0ce3621a3a3cde9c7c275017dbb22095.