brcm47xx: fix switch handling
This fixes some problems with the switch handling
* It now send the messages again to indicate a button for failsafe mode should be pressed
* it does not leak packages between wan and lan any more
* the switch works again in normal mode
The Ethernet connection has to be up when the switch driver switch-robo
is insmoded therefor we just do it again.
Explicitly set enable_vlan to prevent leaking packages.
This should close #13869, #13868 and #13716
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37286
3c298f89-4303-0410-b956-
a3cf2f4a3e73