From: Tao Ren <rentao.bupt@xxxxxxxxx>
Support fixed link in ftgmac100 driver. Fixed link is used on several
Meta OpenBMC platforms, such as Elbert (AST2620) and Wedge400 (AST2520).
Signed-off-by: Tao Ren <rentao.bupt@xxxxxxxxx>
Reviewed-by: Andrew Lunn <andrew@xxxxxxx>