dt-bindings: phy: uniphier-pcie: Add bindings for NX1 SoC

Update PCIe-PHY binding document for UniPhier NX1 SoC. Add a compatible
string for the SoC to the document.
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1635503947-18250-4-git-send-email-hayashi.kunihiko@socionext.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

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

@@ -19,6 +19,7 @@ properties:
       - socionext,uniphier-pro5-pcie-phy
       - socionext,uniphier-ld20-pcie-phy
       - socionext,uniphier-pxs3-pcie-phy
+      - socionext,uniphier-nx1-pcie-phy
 
   reg:
     maxItems: 1