arm: dts: medaitek: fix internal switch link speed of mt7988

The CPU port of mt7988 internal switch uses 10Gb link speed.

diff --git a/arch/arm/dts/mt7988-rfb.dts b/arch/arm/dts/mt7988-rfb.dts
index 14274e2..f013e3e 100644
--- a/arch/arm/dts/mt7988-rfb.dts
+++ b/arch/arm/dts/mt7988-rfb.dts
@@ -57,7 +57,7 @@
 	mediatek,switch = "mt7988";
 
 	fixed-link {
-		speed = <1000>;
+		speed = <10000>;
 		full-duplex;
 		pause;
 	};
diff --git a/arch/arm/dts/mt7988-sd-rfb.dts b/arch/arm/dts/mt7988-sd-rfb.dts
index 9aa198b..fd19930 100644
--- a/arch/arm/dts/mt7988-sd-rfb.dts
+++ b/arch/arm/dts/mt7988-sd-rfb.dts
@@ -48,7 +48,7 @@
 	mediatek,switch = "mt7988";
 
 	fixed-link {
-		speed = <1000>;
+		speed = <10000>;
 		full-duplex;
 		pause;
 	};