arm: dts: mt7623: enable flow control on port@6

Flow control needs to be enabled on both sides to work.
It is already enabled on gmac0, enable it on port@6 too.

Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Link: https://lore.kernel.org/r/20230210182505.24597-5-arinc.unal@arinc9.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm/boot/dts/mt7623a.dtsi

@@ -88,6 +88,7 @@
 					fixed-link {
 						speed = <1000>;
 						full-duplex;
+						pause;
 					};
 				};
 			};

arch/arm/boot/dts/mt7623n-rfb-emmc.dts

@@ -230,6 +230,7 @@
 					fixed-link {
 						speed = <1000>;
 						full-duplex;
+						pause;
 					};
 				};
 			};