ARM: dts: rockchip: Add STMMAC reset signal in GMAC interface for rk3288

Which fixes warning "no reset control found" by the same time
Signed-off-by: Romain Perier <romain.perier@gmail.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rk3288.dtsi

@@ -447,6 +447,8 @@ gmac: ethernet@ff290000 {
 			"mac_clk_rx", "mac_clk_tx",
 			"clk_mac_ref", "clk_mac_refout",
 			"aclk_mac", "pclk_mac";
+		resets = <&cru SRST_MAC>;
+		reset-names = "stmmaceth";
 		status = "disabled";
 	};