net: axienet: Fix compilation error

Add missing header to fix compilation error.
drivers/net/ethernet/xilinx/xilinx_axienet_main.c:1575:22:
 error: undefined identifier 'irq_of_parse_and_map'
drivers/net/ethernet/xilinx/xilinx_axienet_main.c:1576:22:
 error: undefined identifier 'irq_of_parse_and_map'

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