Clean the code by deleting ARP functions, which are not called anyway.

Link: https://lore.kernel.org/r/20191212093830.316934-46-leon@kernel.orgSigned-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>