net: sh_eth: Add remaining Gen2 DT compatible

Add compatible strings for R8A7790, R8A7793 and R8A7794, since the
contemporary DTs use those don't have a generic match value.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Cc: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/drivers/net/sh_eth.c b/drivers/net/sh_eth.c
index e3416f3..cb3970e 100644
--- a/drivers/net/sh_eth.c
+++ b/drivers/net/sh_eth.c
@@ -906,7 +906,10 @@
 }
 
 static const struct udevice_id sh_ether_ids[] = {
+	{ .compatible = "renesas,ether-r8a7790" },
 	{ .compatible = "renesas,ether-r8a7791" },
+	{ .compatible = "renesas,ether-r8a7793" },
+	{ .compatible = "renesas,ether-r8a7794" },
 	{ }
 };