A bunch of kernel modules depends on kmod-usb-net, but does not
select it. Make AddDepends/usb-net selective, so we can drop
some redundant +kmod-usb-net definitions for DEVICE_PACKAGES.
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Signed-off-by: maurerr <mariusd84@gmail.com>