Add a GPIO hog for those two switches to avoid having a dangling GPIO
which might be pulled accidentally breaking all PHYs, and to have that
GPIO documented.
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/23428
Signed-off-by: Robert Marko <robimarko@gmail.com>