sfxge: rename hunt interrupt methods to ef10 and use on Medford

All of these apply to both Huntington and Medford.

Submitted by: Mark Spender <mspender at solarflare.com>
Reviewed by: gnn
Sponsored by: Solarflare Communications, Inc.
MFC after: 2 days
Differential Revision: https://reviews.freebsd.org/D4868