split netmap code according to functions:
- netmap.c base code
- netmap_freebsd.c FreeBSD-specific code
- netmap_generic.c emulate netmap over standard drivers
- netmap_mbq.c simple mbuf tailq
- ne

split netmap code according to functions:
- netmap.c base code
- netmap_freebsd.c FreeBSD-specific code
- netmap_generic.c emulate netmap over standard drivers
- netmap_mbq.c simple mbuf tailq
- netmap_mem2.c memory management
- netmap_vale.c VALE switch

simplify devce-specific code

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