FROMLIST: PCI: qcom: Add QCS615 PCIe support

Add the compatible and the driver data for QCS615 PCIe controller.

There is only one controller instance found on this platform, out of which
is Gen3 with speeds of up to 8.0GT/s.

The version of the controller is 1.38.0 for all instances, but they are
compatible with 1.9.0 config.

Link: https://lore.kernel.org/all/20250507031559.4085159-6-quic_ziyuzhan@quicinc.com/
Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com>
Signed-off-by: Ziyue Zhang <quic_ziyuzhan@quicinc.com>

Author: ziyuezhang-123

drivers/pci/controller/dwc/pcie-qcom.c

@@ -1939,6 +1939,7 @@ static const struct of_device_id qcom_pcie_match[] = {
 	{ .compatible = "qcom,pcie-sm8450-pcie1", .data = &cfg_1_9_0 },
 	{ .compatible = "qcom,pcie-sm8550", .data = &cfg_1_9_0 },
 	{ .compatible = "qcom,pcie-x1e80100", .data = &cfg_sc8280xp },
+	{ .compatible = "qcom,qcs615-pcie", .data = &cfg_1_9_0 },
 	{ }
 };