MIPS: ath79: ar9331: add pause property for the MAC <> switch link

Both, MAC and switch support flow control, so add pause property for the
MAC <> switch link.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/boot/dts/qca/ar9331.dtsi

@@ -148,6 +148,7 @@
 			fixed-link {
 				speed = <1000>;
 				full-duplex;
+				pause;
 			};
 
 			mdio {
@@ -183,6 +184,7 @@
 							fixed-link {
 								speed = <1000>;
 								full-duplex;
+								pause;
 							};
 						};