arm64: dts: qcom: sm8150: add necessary ref clock to PCIe

The PCIe nodes should get the ref clock, according to information from
Qualcomm.

Link: https://lore.kernel.org/all/20231121065440.GB3315@thinkpad/Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20231208105155.36097-4-krzysztof.kozlowski@linaro.orgSigned-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm64/boot/dts/qcom/sm8150.dtsi

@@ -1858,14 +1858,16 @@ pcie0: pcie@1c00000 {
 				 <&gcc GCC_PCIE_0_MSTR_AXI_CLK>,
 				 <&gcc GCC_PCIE_0_SLV_AXI_CLK>,
 				 <&gcc GCC_PCIE_0_SLV_Q2A_AXI_CLK>,
-				 <&gcc GCC_AGGRE_NOC_PCIE_TBU_CLK>;
+				 <&gcc GCC_AGGRE_NOC_PCIE_TBU_CLK>,
+				 <&rpmhcc RPMH_CXO_CLK>;
 			clock-names = "pipe",
 				      "aux",
 				      "cfg",
 				      "bus_master",
 				      "bus_slave",
 				      "slave_q2a",
-				      "tbu";
+				      "tbu",
+				      "ref";
 
 			iommu-map = <0x0   &apps_smmu 0x1d80 0x1>,
 				    <0x100 &apps_smmu 0x1d81 0x1>;
@@ -1949,14 +1951,16 @@ pcie1: pcie@1c08000 {
 				 <&gcc GCC_PCIE_1_MSTR_AXI_CLK>,
 				 <&gcc GCC_PCIE_1_SLV_AXI_CLK>,
 				 <&gcc GCC_PCIE_1_SLV_Q2A_AXI_CLK>,
-				 <&gcc GCC_AGGRE_NOC_PCIE_TBU_CLK>;
+				 <&gcc GCC_AGGRE_NOC_PCIE_TBU_CLK>,
+				 <&rpmhcc RPMH_CXO_CLK>;
 			clock-names = "pipe",
 				      "aux",
 				      "cfg",
 				      "bus_master",
 				      "bus_slave",
 				      "slave_q2a",
-				      "tbu";
+				      "tbu",
+				      "ref";
 
 			assigned-clocks = <&gcc GCC_PCIE_1_AUX_CLK>;
 			assigned-clock-rates = <19200000>;