ARM: mvebu: Convert CONFIG_MVNETA to Kconfig

This converts the following to Kconfig:
   CONFIG_MVNETA

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 5ceea44..d67927c 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -159,6 +159,14 @@
 	help
 	  This MAC is present in Andestech SoCs.
 
+config MVNETA
+	bool "Marvell Armada 385 network interface support"
+	depends on ARMADA_XP || ARMADA_38X
+	select PHYLIB
+	help
+	  This driver supports the network interface units in the
+	  Marvell ARMADA XP and 38X SoCs
+
 config MVPP2
 	bool "Marvell Armada 375/7K/8K network interface support"
 	depends on ARMADA_375 || ARMADA_8K