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 <[e-mail]>
[mani: reworded description]
Signed-off-by: Manivannan Sadhasivam <[e-mail]>
Acked-by: Rob Herring (Arm) <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

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

···
           - enum:
               - qcom,sar2130p-pcie
               - qcom,pcie-sm8650
+              - qcom,pcie-sm8750
           - const: qcom,pcie-sm8550
 
   reg: