net: macb: unify macb_config alignment style

The various macb_config structs have taken different approaches to
alignment when broken over newlines. Pick one style and make them
match.

Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>