MAINTAINERS: review Renesas DT bindings as well

When adding myself  as a reviewer for  the Renesas  Ethernet drivers
I somehow forgot about the bindings -- I want to review them as well.

Fixes: 8e6569a ("MAINTAINERS: add myself as Renesas Ethernet drivers reviewer")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

MAINTAINERS

@@ -11379,6 +11379,8 @@ RENESAS ETHERNET DRIVERS
 R:	Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
 L:	netdev@vger.kernel.org
 L:	linux-renesas-soc@vger.kernel.org
+F:	Documentation/devicetree/bindings/net/renesas,*.txt
+F:	Documentation/devicetree/bindings/net/sh_eth.txt
 F:	drivers/net/ethernet/renesas/
 F:	include/linux/sh_eth.h