boards: silabs: xg27_dk2602a: Set cells properties on usart0

Set #address-cells and #size-cells on usart0. Since usarts can
be used for both UART and SPI, this property shouldn't be set
in SoC-level DTS, since it makes it harder to switch compatible.

Signed-off-by: Aksel Skauge Mellbye <[email protected]>

Author: asmellby

boards/silabs/dev_kits/xg27_dk2602a/thunderboard.dtsi

@@ -93,6 +93,8 @@
 	pinctrl-0 = <&usart0_default>;
 	pinctrl-names = "default";
 
+	#address-cells = <1>;
+	#size-cells = <0>;
 	cs-gpios = <&gpioc 3 GPIO_ACTIVE_LOW>;
 
 	mx25r80: mx25r8035f@0 {