dt-bindings: PCI: sifive,fu740-pcie: Fix include placement in DTS example

Coding style and common logic dictates that headers should not be
included in device nodes.  No functional impact.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20250324125202.81986-2-krzysztof.kozlowski@linaro.org

Author: krzk

Documentation/devicetree/bindings/pci/sifive,fu740-pcie.yaml

@@ -81,10 +81,10 @@ unevaluatedProperties: false
 
 examples:
   - |
+    #include <dt-bindings/clock/sifive-fu740-prci.h>
     bus {
         #address-cells = <2>;
         #size-cells = <2>;
-        #include <dt-bindings/clock/sifive-fu740-prci.h>
 
         pcie@e00000000 {
             compatible = "sifive,fu740-pcie";