Apply the logic used for "protocol" queues to bridge(4).  This allows to defer the work currently done in bridge_input() and requiring the KERNEL_LOCK to bridgeintr().
Apply the logic used for "protocol" queues to bridge(4).  This allows
to defer the work currently done in bridge_input() and requiring the
KERNEL_LOCK to bridgeintr().

Tested by sthen@

ok rzalamena@, dlg@, bluhm@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars