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).
    - Add "options IXL_IW" to kernel config to enable this option.

Sponsored by:	Intel Corporation

- Update ixl(4) to Intel driver version ixl-1.6.6-k
- Fixup RSS builds of ixl(4) missed during testing.

Approved by:	re (gjb)

Changes by author:

Kamil Krawczyk		i40e-shared: use explicit cast from u16 to u8
Anjali Singhai Jain	i40e-shared: Add a Virtchnl offload for RSS PCTYPE V2
Eric Joyner		ixl: Remove HP device IDs.
Jesse Brandeburg	i40e-shared: add small bit of debug
Mitch Williams		i40e-shared: check for stopped admin queue
Mitch Williams		i40e-shared: set aq count after memory allocation
Jesse Brandeburg	i40e-shared: remove forever unused ID
Eric Joyner		ixl: Fix bug where RSS does not hash to more than 16 queues.
Shannon Nelson		i40e-shared: define function capabilities in only one place
Eric Joyner		ixl: Change spacing, comments, and a single error message.
Eric Joyner		ixl: Save admin queue phy interrupt mask as a define.
Eric Joyner		ixl: Move callout_reset() to later in init_locked(), and stop clearing OACTIVE in driver flags.
Eric Joyner		ixl: Add new reset+build flow to init() if it detects that the admin queue is stopped.
Eric Joyner		ixl: Return EACCES instead of EPERM when an nvmupdate command fails.
Eric Joyner		ixl: Remove KX_A device ID.

Differential Revision:  https://reviews.freebsd.org/D6211
Reviewed by:    sbruno, kmacy, jeffrey.e.pieper@intel.com
MFC after:      2 weeks
Sponsored by:   Intel Corporation

This first update will revert some upstream changes; forthcoming updates will reinstate them.

Changes, by author:

Anjali Singhai Jain		i40e-shared: Add WB_ON_ITR offload support
Shannon Nelson			i40e-shared: fix phy_types bitmap type
Kevin Scott			i40e-shared: Store off PHY capabilities
Shannon Nelson			i40e-shared: fix byteswap of phy_type
Jingjing Wu			i40e-shared: Fix compile issue related to const string
Greg Bowers			i40e-shared: Add AQ defines for non-willing Apps (DCB)
Greg Bowers			i40e-shared: Support for non-willing Apps (DCB)
Shannon Nelson			i40e-shared: use upper-32 bit macro for address
Shannon Nelson			i40e-shared: grab the AQ spinlocks before clearing registers
Eric Joyner			ixl: Properly strip out X722_SUPPORT (temporarily).
Eric Joyner			ixl: Allow Fort Pond devices to advertise 100M in set_advertise sysctl.

Differential Revision:  https://reviews.freebsd.org/D6211
Reviewed by:    sbruno, kmacy, jeffrey.e.pieper@intel.com
MFC after:      2 weeks
Sponsored by:   Intel Corporation

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