net: sh-eth: Add to Kconfig and convert

This adds SH_ETHER to drivers/net/Kconfig and convert to Kconfig.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index c47d59c..de1947c 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -276,6 +276,12 @@
 	  It can be found in H3/A64/A83T based SoCs and compatible with both
 	  External and Internal PHYs.
 
+config SH_ETHER
+	bool "Renesas SH Ethernet MAC"
+	select PHYLIB
+	help
+	  This driver supports the Ethernet for Renesas SH and ARM SoCs.
+
 config XILINX_AXIEMAC
 	depends on DM_ETH && (MICROBLAZE || ARCH_ZYNQ || ARCH_ZYNQMP)
 	select PHYLIB