board: mvebu: drop unused ETH_PHY macro definitions

board: mvebu: drop unused ETH_PHY macro definitions

These macros are not used anywhere in the boards code.

Cc: Chris Packham <[email protected]>
Cc: Dirk Eibach <[email protected]>
Cc: Mario Six <[email protected]>
Cc: Dennis Gilmore <[email protected]>
Signed-off-by: Baruch Siach <[email protected]>
Reviewed-by: Stefan Roese <[email protected]>
Signed-off-by: Stefan Roese <[email protected]>