dt-bindings: PCI: intel,lgm-pcie: Fix matching on all snps,dw-pcie instances

The intel,lgm-pcie binding is matching on all snps,dw-pcie instances
which is wrong. Add a custom 'select' entry to fix this.

Fixes: e54ea45a4955 ("dt-bindings: PCI: intel: Add YAML schemas for the PCIe RC controller")
Cc: Bjorn Helgaas <[e-mail]>
Cc: [e-mail]
Reviewed-by: Dilip Kota <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>

Documentation/devicetree/bindings/pci/intel-gw-pcie.yaml

···
 maintainers:
   - Dilip Kota <[e-mail]>
 
+select:
+  properties:
+    compatible:
+      contains:
+        const: intel,lgm-pcie
+  required:
+    - compatible
+
 properties:
   compatible:
     items: