ixgbe(4): Convert driver to use iflib
Initial update to the ixgbe PF and VF drivers to support the iflib interface.
The PF driver version is bumped to 4.0.0, and the VF driver version is bumped to 2.0.0.
Special thanks to sbruno@ for the support in helping make this conversion happen.
Submitted by: Jeb Cramer <email@example.com>, Krzysztof Galazka (Chris) <firstname.lastname@example.org>, Piotr Pietruszewski <email@example.com>
Reviewed by: sbruno@, shurd@, #IntelNetworking
Tested by: Jeffrey Pieper <firstname.lastname@example.org>, Sergey Kozlov <email@example.com>
Sponsored by: Limelight Networks, Intel Corporation
Differential Revision: https://reviews.freebsd.org/D11727