igc: Add NVM/firmware prints and sysctl

This chipset suffered an (un)usual number of bugs and iterations. Let's
add our NVM/firmware code from e1000 and the similar igc_nvm function
from DPDK to kee

igc: Add NVM/firmware prints and sysctl

This chipset suffered an (un)usual number of bugs and iterations. Let's
add our NVM/firmware code from e1000 and the similar igc_nvm function
from DPDK to keep track of issues.

MFC after: 1 week
Sponsored by: BBOX.io

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sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

igc(4): Introduce new driver for the Intel I225 Ethernet controller.

This controller supports 2.5G/1G/100MB/10MB speeds, and allows
tx/rx checksum offload, TSO, LRO, and multi-queue operation.

The

igc(4): Introduce new driver for the Intel I225 Ethernet controller.

This controller supports 2.5G/1G/100MB/10MB speeds, and allows
tx/rx checksum offload, TSO, LRO, and multi-queue operation.

The driver was derived from code contributed by Intel, and modified
by Netgate to fit into the iflib framework.

Thanks to Mike Karels for testing and feedback on the driver.

Reviewed by: bcr (manpages), kbowling, scottl, erj
MFC after: 1 month
Relnotes: yes
Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D30668

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