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ix(4): Add control of 2.5/5G autonegotiation speeds

This change enables the user to control 2.5G and 5G autonegotiation
speeds via advertise_speed sysctl for X550T devices. Due to reported
interoperability issues with switches, 2.5G and 5G speeds will not be
advertised by default.

Signed-off-by: Piotr Pietruszewski <piotr.pietruszewski@intel.com>
Co-authored-by: Krzysztof Galazka <krzysztof.galazka@intel.com>

Tested by:	gowtham.kumar.ks@intel.com
MFC after:	3 days
Sponsored by:	Intel Corporation
Differential Revision: https://reviews.freebsd.org/D26245

(cherry picked from commit d381c807510de2ebb453a563540bd17e344a2aab)

Git Hash:   16453e2edc32d2ae2f36c73917540ecf4bb115dc
Git Author: piotr.pietruszewski@intel.com
END