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sfxge: update SRAM methods to be no-ops on Medford as well

Description

sfxge: update SRAM methods to be no-ops on Medford as well

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/D4867