ix(4): Add EEE support for E610 adapters

The ix driver now supports Energy Efficient Ethernet (EEE) on Intel
E610 devices. EEE allows the network interface to enter low-power
states during periods of low link utilization, reducing power
consumption while maintaining full performance when needed.

E610 adapters provide EEE support through BASE-T PHY functionality.
Due to this PHY-based implementation, EEE is supported only
on 2.5Gb speeds and above.

Signed-off-by: Yogesh Bhosale <yogesh.bhosale@intel.com>
Signed-off-by: Krzysztof Galazka <krzysztof.galazka@intel.com>

Authored-by: Yogesh Bhosale <yogesh.bhosale@intel.com>

Approved by:	kbowling (mentor)
Tested by:	Mateusz Moga <mateusz.moga@intel.com>
MFC after:	2 weeks
Sponsored by:	Intel Corporation
Differential Revision:	https://reviews.freebsd.org/D55304

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