sys: Remove $FreeBSD$: one-line .c comment pattern

Remove /^/[*/]\s*\$FreeBSD\$.*\n/

ixgbe: Update copyright to 2020

Synced to the ixgbe shared code with DPDK shared code which has local
fixes on top of "not-released-cid-ixgbe.2020.06.09.tar.gz"

Approved by: imp
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D31621

ixgbe(4): Update HEAD (p3) to 3.2.12-k

Includes:

- Support for X550EM devices.
- Support for Bypass adapters.
- Flow Director code moved to separate files
- SR-IOV code moved to separate files
- Netmap code moved to separate files

Differential Revision: https://reviews.freebsd.org/D11232
Submitted by: Jeb Cramer <cramerj@intel.com>
Reviewed by: erj@
Tested by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Sponsored by: Intel Corporation