kernel: v4l2: Fixes for numerous issues
See: http://www.raspberrypi.org/phpBB3/viewtopic.php?f=43&t=62364&start=75#p471657

kernel: config: Add CONFIG_IPV6_TUNNEL
See: https://github.com/raspberrypi/linux/issues/464

kernel: 1-wire: Add support for configuring pin for w1-gpio kernel module
See: https://github.com/raspberrypi/linux/pull/457

kernel: config: Enable CONFIG_MEMCG, but leave it disabled (due to memory cost). Enable with cgroup_enable=memory