OPNSense/src b9df35csys/dev/netmap netmap_kloop.c netmap.c, sys/net netmap.h

MFC r343689

netmap: upgrade sync-kloop support

Add SYNC_KLOOP_MODE option, and add support for direct mode, where application
executes the TXSYNC and RXSYNC in the context of the ioeventfd wake up callback.
DeltaFile
+309-98sys/dev/netmap/netmap_kloop.c
+23-2sys/net/netmap.h
+5-4sys/dev/netmap/netmap.c
+9-0sys/dev/netmap/netmap_kern.h
+346-1044 files

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