arm64: dts: ls1028a: sl28: use ocelot-8021q tagging by default

Enable the ocelot-8021q tagger by default which supports ethernet flow
control.

The new default is set in the common board dtsi. The actual switch
node is enabled on a per board variant basis. Because of this we
set the new tagger default for both internal ports and a particular
variant is free to choose among the two port.
Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/fsl-ls1028a-kontron-sl28.dts

@@ -311,6 +311,14 @@ &lpuart1 {
 	status = "okay";
 };
 
+&mscc_felix_port4 {
+	dsa-tag-protocol = "ocelot-8021q";
+};
+
+&mscc_felix_port5 {
+	dsa-tag-protocol = "ocelot-8021q";
+};
+
 &usb0 {
 	status = "okay";
 };