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: e54ea45 ("dt-bindings: PCI: intel: Add YAML schemas for the PCIe RC controller")
Cc: Bjorn Helgaas <[email protected]>
Cc: [email protected]
Reviewed-by: Dilip Kota <[email protected]>
Signed-off-by: Rob Herring <[email protected]>

Author: robherring

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

@@ -9,6 +9,14 @@ title: PCIe RC controller on Intel Gateway SoCs
 maintainers:
   - Dilip Kota <[email protected]>
 
+select:
+  properties:
+    compatible:
+      contains:
+        const: intel,lgm-pcie
+  required:
+    - compatible
+
 properties:
   compatible:
     items: