The MikroTik RouterBOARD wAPR-2nD (wAP R) router features a miniPCI-e
slot with USB lines connected, which are used by some USB cards with
miniPCI-e form factor, like the R11e-LR8. Enabling USB support is
required for such cards to work.
Tested on a MikroTik wAP LR8 kit (RB wAPR-2nD + R11e-LR8).
Signed-off-by: Roger Pueyo Centelles <roger.pueyo@guifi.net>