e1000: Remove redundant disable_ulp for ich8lan
This call only makes sense for ich8lan, and the shared code does it in
e1000_setup_init_funcs() above this deletion.
Obtained from: DPDK
Sponsored by: BBOX.io
Pull Request: https://github.com/freebsd/freebsd-src/pull/539
(cherry picked from commit d36fbdb08ff567393a698aaf16f726275901ec96)