tg3: Apply 10Mbps fix to all 57765 revisions

Commit a977dbe8445b8a81d6127c4aa9112a2c29a1a008, entitled
"tg3: Reduce 57765 core clock when link at 10Mbps" needs to be applied
to all revisions of the 57765 asic rev, not just the A0 revision.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>