net: sh-eth: Add support R8A7791

R8A7791 has the same sh-ether IP core as other SH/rmobile.
This patch adds support of R8A7791.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
CC: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
CC: Joe Hershberger <joe.hershberger@gmail.com>
diff --git a/drivers/net/sh_eth.c b/drivers/net/sh_eth.c
index 9020752..5e132f2 100644
--- a/drivers/net/sh_eth.c
+++ b/drivers/net/sh_eth.c
@@ -410,7 +410,7 @@
 
 #if defined(CONFIG_CPU_SH7734) || defined(CONFIG_R8A7740)
 	sh_eth_write(eth, CONFIG_SH_ETHER_SH7734_MII, RMII_MII);
-#elif defined(CONFIG_R8A7790)
+#elif defined(CONFIG_R8A7790) || defined(CONFIG_R8A7791)
 	sh_eth_write(eth, sh_eth_read(eth, RMIIMR) | 0x1, RMIIMR);
 #endif
 	/* Configure phy */
@@ -435,7 +435,8 @@
 		sh_eth_write(eth, GECMR_100B, GECMR);
 #elif defined(CONFIG_CPU_SH7757) || defined(CONFIG_CPU_SH7752)
 		sh_eth_write(eth, 1, RTRATE);
-#elif defined(CONFIG_CPU_SH7724) || defined(CONFIG_R8A7790)
+#elif defined(CONFIG_CPU_SH7724) || defined(CONFIG_R8A7790) || \
+		defined(CONFIG_R8A7791)
 		val = ECMR_RTM;
 #endif
 	} else if (phy->speed == 10) {