net: sh_eth: add support for SH7757's ETHER

The SH7757 has 2 Fast Ethernet controller (ETHER) and 2 Gigabit Ethernet
Controller (GETHER). This patch supports 2 ETHER only.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 60d067a..f65857e 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -530,14 +530,15 @@
 	depends on SUPERH && \
 		(CPU_SUBTYPE_SH7710 || CPU_SUBTYPE_SH7712 || \
 		 CPU_SUBTYPE_SH7763 || CPU_SUBTYPE_SH7619 || \
-		 CPU_SUBTYPE_SH7724)
+		 CPU_SUBTYPE_SH7724 || CPU_SUBTYPE_SH7757)
 	select CRC32
 	select MII
 	select MDIO_BITBANG
 	select PHYLIB
 	help
 	  Renesas SuperH Ethernet device driver.
-	  This driver support SH7710, SH7712, SH7763, SH7619, and SH7724.
+	  This driver supporting CPUs are:
+		- SH7710, SH7712, SH7763, SH7619, SH7724, and SH7757.
 
 config SUNLANCE
 	tristate "Sun LANCE support"