ixgbe: add register definitions for NVM update

Added additional register for X550 and above device family.

Signed-off-by: Piotr Skajewski <piotrx.skajewski@intel.com>
Signed-off-by: Guinan Sun <guinanx.sun@intel.com>
Reviewed-by: Wei Zhao <wei.zhao1@intel.com>

Approved by: imp
Obtained from: DPDK (4a6847d78814b1c3df896efe31562643d419317d)
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D31621

(cherry picked from commit ff8db817abbd348f0a7518ce32f0e52c6ab8e06e)