dt-bindings: ata: apm,xgene-ahci: Add apm,xgene-ahci-v2 support

The "apm,xgene-ahci-v2" compatible has been in use for a long time, but
was undocumented. It doesn't require clocks or phys.

Remove the "apm,xgene-ahci-pcie" compatible which isn't used anywhere
while we're here.

Signed-off-by: Rob Herring (Arm) <[e-mail]>
Signed-off-by: Damien Le Moal <[e-mail]>

Documentation/devicetree/bindings/ata/apm,xgene-ahci.yaml

···
 maintainers:
   - Rob Herring <[e-mail]>
 
-allOf:
-  - $ref: ahci-common.yaml#
-
 properties:
   compatible:
     enum:
       - apm,xgene-ahci
-      - apm,xgene-ahci-pcie
+      - apm,xgene-ahci-v2
 
   reg:
     minItems: 4
···
 
 required:
   - compatible
-  - clocks
-  - phys
-  - phy-names
 
 unevaluatedProperties: false
+
+allOf:
+  - $ref: ahci-common.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: apm,xgene-ahci
+    then:
+      required:
+        - clocks
+        - phys
+        - phy-names
 
 examples:
   - |