sh_eth: enable wake-on-lan for r8a7740/armadillo

Geert Uytterhoeven reported WoL worked on his Armadillo board.
Signed-off-by: NNiklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Tested-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/renesas/sh_eth.c

@@ -576,6 +576,7 @@ static struct sh_eth_cpu_data r8a7740_data = {
 	.hw_checksum	= 1,
 	.tsu		= 1,
 	.select_mii	= 1,
+	.magic		= 1,
 };
 
 /* There is CPU dependent code */