net: ethernet: ti: am65-cpsw: Move code to avoid forward declaration

Move this code around to avoid forward declaration.
No functional change.

Signed-off-by: Roger Quadros <rogerq@kernel.org>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>