net: context: Add locking to IPv6, CAN and packet socket bind

The commit 93e5181f ("net: context: Add locking for concurrent
access") added net_context locking to only IPv4 sockets.
That is not enough and we need locking also to other supported
socket address families like IPv6, SocketCAN and packet socket.

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>