dt-bindings: phy: uniphier: Fix incorrect clocks and clock-names for PXs3 usb3-hsphy

The usb3-hsphy for PXs3 SoC needs to accept 3 clocks like usb3-ssphy.

Fixes: 134ab284 ("dt-bindings: phy: Convert UniPhier USB3-PHY conroller to json-schema")
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Link: https://lore.kernel.org/r/1594198664-29381-1-git-send-email-hayashi.kunihiko@socionext.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/socionext,uniphier-usb3hs-phy.yaml

@@ -31,12 +31,16 @@ properties:
 
   clocks:
     minItems: 1
-    maxItems: 2
+    maxItems: 3
 
   clock-names:
     oneOf:
       - const: link          # for PXs2
-      - items:               # for PXs3
+      - items:               # for PXs3 with phy-ext
+        - const: link
+        - const: phy
+        - const: phy-ext
+      - items:               # for others
         - const: link
         - const: phy