arm64: dts: qcom: sm8250: Add SDHCI2 sleep mode pinctrl

Add required pins for SDHCI2, so that the interface can work reliably.
This commit adds sleep_state setup to the SoC DTSI, as it is common for
all boards.
Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Link: https://lore.kernel.org/r/20210616002321.74155-2-konrad.dybcio@somainline.orgSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

arch/arm64/boot/dts/qcom/sm8250.dtsi

@@ -3469,6 +3469,26 @@ ws {
 					output-high;
 				};
 			};
+
+			sdc2_sleep_state: sdc2-sleep {
+				clk {
+					pins = "sdc2_clk";
+					drive-strength = <2>;
+					bias-disable;
+				};
+
+				cmd {
+					pins = "sdc2_cmd";
+					drive-strength = <2>;
+					bias-pull-up;
+				};
+
+				data {
+					pins = "sdc2_data";
+					drive-strength = <2>;
+					bias-pull-up;
+				};
+			};
 		};
 
 		apps_smmu: iommu@15000000 {