arm64: dts: qcom: sm8550: fix qup_spi0_cs node

The node is incomplete and doesn't need a subnode, add the missing
properties and move everything to the root of qup-spi0-cs-state node.

Fixes: ffc50b2d ("arm64: dts: qcom: Add base SM8550 dtsi")
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230308-topic-sm8550-upstream-dt-fixups-v1-2-595b02067672@linaro.org

arch/arm64/boot/dts/qcom/sm8550.dtsi

@@ -2799,10 +2799,10 @@ qup_i2c15_data_clk: qup-i2c15-data-clk-state {
 			};
 
 			qup_spi0_cs: qup-spi0-cs-state {
-				cs-pins {
-					pins = "gpio31";
-					function = "qup1_se0";
-				};
+				pins = "gpio31";
+				function = "qup1_se0";
+				drive-strength = <6>;
+				bias-disable;
 			};
 
 			qup_spi0_data_clk: qup-spi0-data-clk-state {