dt-bindings: thermal: uniphier: Add binding for NX1 SoC

Update thermal binding document for UniPhier NX1 SoC.
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Link: https://lore.kernel.org/r/1634520891-16801-2-git-send-email-hayashi.kunihiko@socionext.comSigned-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

Documentation/devicetree/bindings/thermal/socionext,uniphier-thermal.yaml

@@ -20,6 +20,7 @@ properties:
       - socionext,uniphier-pxs2-thermal
       - socionext,uniphier-ld20-thermal
       - socionext,uniphier-pxs3-thermal
+      - socionext,uniphier-nx1-thermal
 
   interrupts:
     maxItems: 1