arm64: dts: arm: juno: Remove legacy Coresight 'slave-mode' property

The 'slave-mode' property is not valid under 'in-ports' as it was the
legacy way to find input ports. Warnings are generated from the Coresight
schema:

arch/arm64/boot/dts/arm/juno-r1.dtb: funnel@20150000: in-ports:port@0:endpoint: Unevaluated properties are not allowed ('slave-mode' was unexpected)
        From schema: Documentation/devicetree/bindings/arm/arm,coresight-dynamic-funnel.yaml

Link: https://lore.kernel.org/r/20220721212952.1984382-1-robh@kernel.orgReviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

arch/arm64/boot/dts/arm/juno-cs-r1r2.dtsi

@@ -67,7 +67,6 @@ in-ports {
 			port@0 {
 				reg = <0>;
 				csys2_funnel_in_port0: endpoint {
-					slave-mode;
 					remote-endpoint = <&etf0_out_port>;
 				};
 			};
@@ -75,7 +74,6 @@ csys2_funnel_in_port0: endpoint {
 			port@1 {
 				reg = <1>;
 				csys2_funnel_in_port1: endpoint {
-					slave-mode;
 					remote-endpoint = <&etf1_out_port>;
 				};
 			};