arm64: dts: rockchip: add missing tx/rx-fifo-depth for rk3328 gmac

Without fifo depths attempting to change the MTU will fail. These values
are from the RK3328 Technical Reference Manual, gmac2io interface tested
with Rock64.
Signed-off-by: shironeko <shironeko@tesaguri.club>
Link: https://lore.kernel.org/r/20231116214042.11134-2-shironeko@tesaguri.clubSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3328.dtsi

@@ -916,6 +916,8 @@ gmac2io: ethernet@ff540000 {
 		resets = <&cru SRST_GMAC2IO_A>;
 		reset-names = "stmmaceth";
 		rockchip,grf = <&grf>;
+		tx-fifo-depth = <2048>;
+		rx-fifo-depth = <4096>;
 		snps,txpbl = <0x4>;
 		status = "disabled";
 	};
@@ -938,6 +940,8 @@ gmac2phy: ethernet@ff550000 {
 		reset-names = "stmmaceth";
 		phy-mode = "rmii";
 		phy-handle = <&phy>;
+		tx-fifo-depth = <2048>;
+		rx-fifo-depth = <4096>;
 		snps,txpbl = <0x4>;
 		clock_in_out = "output";
 		status = "disabled";