e1000: bump driver version

Incrementing these to avoid confusion in users; we are on par with these
out of tree versions.

Reviewed by: erj
Sponsored by: BBOX.io
Pull Request: https://github.com/freebsd/freebsd-src/pull/540

(cherry picked from commit 647f2d2bc0cb9357ac083bf2aae4b669167dd66b)