net/ethoc: add Kconfig entry for the driver

Add Kconfig entry for the driver, remove #define CONFIG_ETHOC from the
only board configuration that uses it and put it into that board's
defconfig.

Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

configs/openrisc-generic_defconfig

@@ -6,5 +6,7 @@ CONFIG_TARGET_OPENRISC_GENERIC=y
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
+CONFIG_NETDEVICES=y
+CONFIG_ETHOC=y
 CONFIG_SYS_NS16550=y
 # CONFIG_AUTOBOOT is not set

drivers/net/Kconfig

@@ -124,6 +124,11 @@ config ETH_DESIGNWARE
 	  100Mbit and 1 Gbit operation. You must enable CONFIG_PHYLIB to
 	  provide the PHY (physical media interface).
 
+config ETHOC
+	bool "OpenCores 10/100 Mbps Ethernet MAC"
+	help
+	  This MAC is present in OpenRISC and Xtensa XTFPGA boards.
+
 config MVPP2
 	bool "Marvell Armada 375 network interface support"
 	depends on ARMADA_375

include/configs/openrisc-generic.h

@@ -44,7 +44,6 @@
 /*
  * Ethernet
  */
-#define CONFIG_ETHOC
 #define CONFIG_SYS_ETHOC_BASE		0x92000000
 
 #define CONFIG_BOOTFILE			"boot.img"