Finishes the conversion of the 40Gb Intel Ethernet drivers to iflib(9) for
FreeBSD 12.0, and fixes numerous bugs in both ixl(4) and iavf(4).

This commit also re-adds the VF driver to GENERIC since it now compiles and
functions.

The VF driver name was changed from ixlv(4) to iavf(4) because the VF driver is
now intended to be used with future products, not just with Fortville/Fort Park
VFs.

A man page update that documents these drivers is forthcoming in a separate
commit.

Reviewed by:    sbruno@, kbowling@
Tested by:      jeffrey.e.pieper@intel.com
Approved by:	re (gjb@)
Relnotes:       yes
Sponsored by:   Intel Corporation
Differential Revision: https://reviews.freebsd.org/D16429

Update the driver to use iflib in order to bring performance,
maintainability, and (hopefully) stability benefits to the driver.

The driver currently isn't completely ported; features that are missing:

- VF driver (ixlv)
- SR-IOV host support
- RDMA support

The plan is to have these re-added to the driver before the next FreeBSD release.

Reviewed by:	gallatin@
Contributions by: gallatin@, mmacy@, krzysztof.galazka@intel.com
Tested by:	jeffrey.e.pieper@intel.com
MFC after:	1 month
Sponsored by:	Intel Corporation
Differential Revision:	https://reviews.freebsd.org/D15577

This simplifies make output/logic

Tested with:	`cd sys/modules; make ALL_MODULES=` on amd64
MFC after:	1 month
Sponsored by:	Dell EMC Isilon

Refresh upstream driver before impending conversion to iflib.

Major new features:

- Support for Fortville-based 25G adapters
- Support for I2C reads/writes

(To prevent getting or sending corrupt data, you should set
dev.ixl.0.debug.disable_fw_link_management=1 when using I2C
[this will disable link!], then set it to 0 when done. The driver implements
the SIOCGI2C ioctl, so ifconfig -v works for reading I2C data,
but there are read_i2c and write_i2c sysctls under the .debug sysctl tree
[the latter being useful for upper page support in QSFP+]).

- Addition of an iWARP client interface (so the future iWARP driver for
  X722 devices can communicate with the base driver).
  - Compiling this option in is enabled by default, with "options IXL_IW" in
    GENERIC.

Differential Revision:	https://reviews.freebsd.org/D9227
Reviewed by:	sbruno
MFC after:	2 weeks
Sponsored by:	Intel Corporation

Submitted by:	erj
Reviewed by:	jeffrey.e.pieper@intel.com
MFC after:	3 days
Sponsored by:	Intel Corporation
Differential Revision:	https://reviews.freebsd.org/D7391

MFC after:	3 days
Sponsored by:	EMC / Isilon Storage Division

Sponsored by:	EMC / Isilon Storage Division

code update, with supporting changes in the CORE. Changes for the extended
media types, VF driver has virtual channel protocol changes, and some
register use corrections.  This software change should be coordinated with
Firmware updates to your hardware, contact your support channels for that.

MFC after:	1 week

	if_ixl to version 1.3.0, if_ixlv to version 1.2.0
	- Major change in both drivers is to add RSS support
	- In ixl fix some interface speed related issues, dual
	  speed was not changing correctly, KR/X media was not
	  displaying correctly (this has a workaround until a
	  more robust media handling is in place)
	- Add a warning when using Dell NPAR and the speed is
	  less than 10G
	- Wrap a queue hung message in IXL_DEBUG, as it is non-fatal,
	  and without tuning can display excessively

MFC after: 1 week

	-Improved VF stability, thanks to changes from Ryan Stone,
	 and Juniper.
	- RSS fixes in the ixlv driver
	- link detection in the ixlv driver
	- New sysctl's added in ixl and ixlv
	- reset timeout increased for ixlv
	- stability fixes in detach
	- correct media reporting
	- Coverity warnings fixed
	- Many small bug fixes
	- VF Makefile modified - nvm shared code needed
	- remove unused sleep channels in ixlv_sc struct

Submitted by: Eric Joyner (committed by jfv)
MFC after:	1 week