ix(4): Support Total Port Shutdown on E610HEADmain

Firmware controls the physical link state on E610 adapters, similarly to
X700 and E800 adapters. As a result, running "ifconfig down" does not
disable the physical link unless Total Port Shutdown is enabled.

Read the Link Default Override TLV from NVM to detect when Total
Port Shutdown was enabled for given port in system setup. In that
case, force the link down when the interface is stopped and restore
it during link configuration. Leave link state management unchanged
when the TLV is unavailable or the feature is not enabled.

Co-authored-by:	Miłosz Linkiewicz <milosz.linkiewicz@intel.com>
Co-authored-by:	Tomasz Lichwala <tomasz.lichwala@intel.com>
Signed-off-by: Krzysztof Galazka <krzysztof.galazka@intel.com>

Tested by:      Mateusz Moga <mateusz.moga@intel.com>
MFC after:      1 week
Sponsored by:   Intel Corporation
Differential Revision:	https://reviews.freebsd.org/D60643

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