arm64: dts: qcom: sm8450: drop incorrect cells from serial

The serial/UART device node does not have children with unit addresses,
so address/size cells are not correct.

Fixes: f5837418 ("arm64: dts: qcom: sm8450: add uart20 node")
Fixes: 5188049c ("arm64: dts: qcom: Add base SM8450 DTSI")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230124084951.38195-3-krzysztof.kozlowski@linaro.org

arch/arm64/boot/dts/qcom/sm8450.dtsi

@@ -1017,8 +1017,6 @@ uart20: serial@894000 {
 				pinctrl-names = "default";
 				pinctrl-0 = <&qup_uart20_default>;
 				interrupts = <GIC_SPI 587 IRQ_TYPE_LEVEL_HIGH>;
-				#address-cells = <1>;
-				#size-cells = <0>;
 				status = "disabled";
 			};
 
@@ -1411,8 +1409,6 @@ uart7: serial@99c000 {
 				pinctrl-names = "default";
 				pinctrl-0 = <&qup_uart7_tx>, <&qup_uart7_rx>;
 				interrupts = <GIC_SPI 608 IRQ_TYPE_LEVEL_HIGH>;
-				#address-cells = <1>;
-				#size-cells = <0>;
 				status = "disabled";
 			};
 		};