connectx4: Fix recv completion queue wrap-around
connectx4: Fix recv completion queue wrap-around

Enabled "overflow ignore" on the receive completion queue so that we do
not need to acknowledge completion entries. This should be safe because
the completion queue and the receive queue are the same size i.e. each
receive queue entry will have a separate completion entry with no
collisions.

Igalia/snabb,snabbco/snabb,Igalia/snabb,eugeneia/snabb,eugeneia/snabb,snabbco/snabb,snabbco/snabb,snabbco/snabb,Igalia/snabb,eugeneia/snabb,snabbco/snabb,eugeneia/snabb,SnabbCo/snabbswitch,eugeneia/snabb,eugeneia/snabb,eugeneia/snabb,Igalia/snabb,snabbco/snabb,SnabbCo/snabbswitch,Igalia/snabb,Igalia/snabb,Igalia/snabb,snabbco/snabb,SnabbCo/snabbswitch,snabbco/snabb,Igalia/snabb,SnabbCo/snabbswitch,eugeneia/snabb