orion: update kernel to version 4.14

orion: update kernel to version 4.14

This adds support for kernel 4.14 to the target and directly make it the
default kernel version to use.

This patch is build-tested only, but has never been device-tested. It is
only added to preserve the changes in Git history prior to removing this
target. Use it with care.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
[rebased and extended commit message, refreshed patches for 4.14.162]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>