arm64: dts: broadcom: bcmbca: bcm4908: drop invalid switch cells

Ethernet switch does not have addressable subnodes.

This fixes:
arch/arm64/boot/dts/broadcom/bcmbca/bcm4908-asus-gt-ac5300.dtb: ethernet-switch@0: '#address-cells', '#size-cells' do not match any of the regexes: 'pinctrl-[0-9]+'
        from schema $id: http://devicetree.org/schemas/net/dsa/brcm,sf2.yaml#

Fixes: 527a3ac ("arm64: dts: broadcom: bcm4908: describe internal switch")
Signed-off-by: Rafał Miłecki <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Florian Fainelli <[email protected]>

Author: Rafał Miłecki

arch/arm64/boot/dts/broadcom/bcmbca/bcm4908.dtsi

@@ -227,9 +227,6 @@
 				brcm,num-gphy = <5>;
 				brcm,num-rgmii-ports = <2>;
 
-				#address-cells = <1>;
-				#size-cells = <0>;
-
 				ports: ports {
 					#address-cells = <1>;
 					#size-cells = <0>;