Lede: iw: re-add connect feature

This patch adds the connect feature to iw.
This patch is ported from the Freifunk Hochstift guys who already used it
with openwrt:
https://git.ffho.net/FreifunkHochstift/ffho-site/src/stable/patches/0001-openwrt-patch-iw.patches



It now works with a current lede.

Signed-off-by: Chris Fiege <chris@tinyhost.de>