ixl(4): Update to 1.9.8-k
Refresh upstream driver before impending conversion to iflib.
Major changes:
* Support for descriptor writeback mode
* Ability to disable firmware LLDP agent by user (Bug [[ https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221530 | 221530 ]])
* Fix for TX queue hang when using TSO (Bug [[ https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221919 | 221919 ]])
* Separate descriptor ring sizes for TX and RX rings
Full history of changes in this update is available in GitHub repository: https://github.com/intel-wired-ethernet/freebsd/commits/ixl-update