Migrate CONFIG_DRIVER_TI_CPSW to Kconfig

This converts CONFIG_DRIVER_TI_CPSW to Kconfig

Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index f2cfcb0..98573cb 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -11,6 +11,13 @@
 	  This is currently implemented in net/eth.c
 	  Look in include/net.h for details.
 
+config DRIVER_TI_CPSW
+	bool "TI Common Platform Ethernet Switch"
+	select PHYLIB
+	help
+	  This driver supports the TI three port switch gigabit ethernet
+	  subsystem found in the TI SoCs.
+
 menuconfig NETDEVICES
 	bool "Network device support"
 	depends on NET