Signed-off-by: Alex Eickhoff <alex@artbanause.de>

ar71xx-generic: add support for TP-Link TL-MR3220 v2

Update OpenWrt base

fix latest stable-release-branch for master

site.rst: document ingress/egress unit in simple_tc

This conflicts with our reset button usage.

Otherwise some dependencies aren't respected.

Document changes to hostname_prefix field of site.conf

With this change, there are two OpenWrt config files: one for the packages
actually used by Gluon, and one with all kernel modules enabled (like it was
since we removed the static kernel configs). The config with all kernel modules
is only used to generate the kernel configuration (so it is compatible with the
upstream kernel).

This should bring the build times back to what they were before the static
configs were removed.