dt-bindings: phy: Add Amlogic A1 USB2 PHY Bindings

Add the Amlogic A1 Family USB2 PHY Bindings

It supports Host mode only.

Signed-off-by: Yue Wang <[e-mail]>
Signed-off-by: Hanjie Lin <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Signed-off-by: Kishon Vijay Abraham I <[e-mail]>

Documentation/devicetree/bindings/phy/amlogic,meson-g12a-usb2-phy.yaml

···
   compatible:
     enum:
       - amlogic,meson-g12a-usb2-phy
+      - amlogic,meson-a1-usb2-phy
 
   reg:
     maxItems: 1
···
   - resets
   - reset-names
   - "#phy-cells"
+
+if:
+  properties:
+    compatible:
+      enum:
+        - amlogic,meson-a1-usb-ctrl
+
+then:
+  properties:
+    power-domains:
+      maxItems: 1
+  required:
+    - power-domains
 
 examples:
   - |