net: ll_temac: Remove unnecessary ether_setup after alloc_etherdev

Calling ether_setup is redundant since alloc_etherdev calls it.

Signed-off-by: Subbaraya Sundeep Bhatta <sbhatta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>