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sfxge(4): add routine to check for hardware presence

Description

sfxge(4): add routine to check for hardware presence

Add efx_nic_hw_unavailable() routine to check for hardware presence
before continuing with NIC operations.

Submitted by: Andy Moreton <amoreton at solarflare.com>
Sponsored by: Solarflare Communications, Inc.
Differential Revision: https://reviews.freebsd.org/D18260

Details