apm821xx: move fifo-entry-size property to WNDR4700

This property (and value) came from Netgear's WNDR4700
stock firmware dts. However, other devices do not set
it and the EMAC default is 16, which matches that of
the programming notes of the APM82181 spec.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

target/linux/apm821xx/dts/apm82181.dtsi

@@ -339,7 +339,6 @@
 				max-frame-size = <9000>;
 				rx-fifo-size = <16384>;
 				tx-fifo-size = <2048>;
-				fifo-entry-size = <10>;
 				phy-mode = "rgmii";
 				phy-map = <0x00000000>;
 				rgmii-device = <&RGMII0>;

target/linux/apm821xx/dts/netgear-wndr4700.dts

@@ -288,6 +288,7 @@
 &EMAC0 {
 	status = "okay";
 	phy-handle = <&phy0>;
+	fifo-entry-size = <10>;
 
 	mdio {
 		#address-cells = <1>;