dt-bindings: PCI: qcom,pcie-sm8550: Add SM8750 compatible

PCIe controller present in SM8750 SoC is backwards compatible with the
controller present in SM8550 SoC. Hence, add the compatible with SM8550
fallback.

Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>
[mani: reworded description]
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20250826-pakala-v3-1-721627bd5bb0@oss.qualcomm.com

Author: krishnachaitanya-linux

Documentation/devicetree/bindings/pci/qcom,pcie-sm8550.yaml

@@ -22,6 +22,7 @@ properties:
           - enum:
               - qcom,sar2130p-pcie
               - qcom,pcie-sm8650
+              - qcom,pcie-sm8750
           - const: qcom,pcie-sm8550
 
   reg: