docs: update list of XDP compatible drivers

Add missing nfp driver to the list.

While we're at it, add name and pointers for other drivers for which XDP
support is known to exist, but has not yet been pushed to the main
kernel branch.

Note that e1000e is not available online at this date, the link points
to an email stating that the patch could be provided upon request.

docs/kernel-versions.md

@@ -77,10 +77,13 @@ Action: direct forwarding (on same port) | 4.8 | [6ce96ca348a9](https://git.kern
 Direct packet data write | 4.8 | [4acf6c0b84c9](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4acf6c0b84c91243c705303cd9ff16421914150d)
 Mellanox `mlx4` driver | 4.8 | [47a38e155037](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=47a38e155037f417c5740e24ccae6482aedf4b68)
 Mellanox `mlx5` driver | 4.9 | [86994156c736](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=86994156c736978d113e7927455d4eeeb2128b9f)
+Netronome `nfp` driver | 4.10 | [ecd63a0217d5](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ecd63a0217d5f1e8a92f7516f5586d1177b95de2)
 QLogic (Cavium) `qed*` drivers | 4.10 | [496e05170958](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=496e051709588f832d7a6a420f44f8642b308a87)
 `virtio_net` driver | 4.10 | [f600b6905015](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f600b690501550b94e83e07295d9c8b9c4c39f4e)
 Broadcom `bnxt_en` driver | [4.11](https://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit/?id=c6d30e8391b85e00eb544e6cf047ee0160ee9938) | []()
-Intel `i40e` driver | ? | []()
+Intel `e1000` driver | | [Not upstream yet](https://git.kernel.org/pub/scm/linux/kernel/git/ast/bpf.git/commit/?h=xdp&id=0afee87cfc800bf3317f4dc8847e6f36539b820c)
+Intel `e1000e` driver | | [Not upstream yet](https://lists.iovisor.org/pipermail/iovisor-dev/2017-April/000705.html)
+Intel `i40e` driver | | [Not upstream yet](https://www.spinics.net/lists/netdev/msg409498.html)
 
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