kernel/netmap: Move headers into <net/netmap/...>.

Note that netmap isn't hooked into the build right now, and because of
that, this commit results in removing them from their current location.

Som

kernel/netmap: Move headers into <net/netmap/...>.

Note that netmap isn't hooked into the build right now, and because of
that, this commit results in removing them from their current location.

Some dports like net/libpcap started breaking after 2c68437386f4be2ed45a4
because configure found a building netmap_user.h and decided that we have
a current and usable netmap.

Reported-by: zrj

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