The Netgear EX6150 has an Access Point/Extender switch. Set it as
an EV_SW. Otherwise when it's set to Access Point, it will trigger
failsafe mode during boot.
Fixes: FS#3590
Signed-off-by: Kurt Roeckx <kurt@roeckx.be>
(cherry picked from commit 539966554d)
Signed-off-by: CN_SZTL <cnsztl@project-openwrt.eu.org>