Add support the Korina (IDT RC32434) Ethernet MAC

This patch adds support for the IDT rc32434 Ethernet MAC
we can find in the IDT boards and the Mikrotik RB500.
Driver references some code from the linux-mips RB500
support.
Signed-off-by: Florian Fainelli <florian.fainelli@telecomint.eu>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Philip Rischel <rischelp@idt.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/Kconfig

@@ -467,6 +467,13 @@ config SNI_82596
 	  Say Y here to support the on-board Intel 82596 ethernet controller
 	  built into SNI RM machines.
 
+config KORINA
+	tristate "Korina (IDT RC32434) Ethernet support"
+	depends on NET_ETHERNET && MIKROTIK_RB500
+	help
+	  If you have a Mikrotik RouterBoard 500 or IDT RC32434
+	  based system say Y. Otherwise say N.
+
 config MIPS_JAZZ_SONIC
 	tristate "MIPS JAZZ onboard SONIC Ethernet support"
 	depends on MACH_JAZZ

drivers/net/Makefile

@@ -190,6 +190,7 @@ obj-$(CONFIG_ZORRO8390) += zorro8390.o
 obj-$(CONFIG_HPLANCE) += hplance.o 7990.o
 obj-$(CONFIG_MVME147_NET) += mvme147.o 7990.o
 obj-$(CONFIG_EQUALIZER) += eql.o
+obj-$(CONFIG_KORINA) += korina.o
 obj-$(CONFIG_MIPS_JAZZ_SONIC) += jazzsonic.o
 obj-$(CONFIG_MIPS_AU1X00_ENET) += au1000_eth.o
 obj-$(CONFIG_MIPS_SIM_NET) += mipsnet.o