arm: socfpga: misc: Probe ethernet GMAC from OF

The GMAC can now be probed from OF, so enable DM ethernet and remove the
old ad-hoc designware_initialize() invocation.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
Cc: Joe Hershberger <joe.hershberger@ni.com>

arch/arm/mach-socfpga/misc.c

@@ -82,9 +82,7 @@ int cpu_eth_init(bd_t *bis)
 	/* Release the EMAC controller from reset */
 	socfpga_per_reset(reset, 0);
 
-	/* initialize and register the emac */
-	return designware_initialize(CONFIG_EMAC_BASE,
-				     CONFIG_PHY_INTERFACE_MODE);
+	return 0;
 }
 #endif