dt-bindings: clock: uniphier: Add NX1 clock binding

Update clock binding document for UniPhier NX1 SoC.

Signed-off-by: Masahiro Yamada <[e-mail]>
Signed-off-by: Kunihiko Hayashi <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Acked-by: Rob Herring <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

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

···
           - socionext,uniphier-ld11-clock
           - socionext,uniphier-ld20-clock
           - socionext,uniphier-pxs3-clock
+          - socionext,uniphier-nx1-clock
       - description: Media I/O (MIO) clock, SD clock
         enum:
           - socionext,uniphier-ld4-mio-clock
···
           - socionext,uniphier-ld11-mio-clock
           - socionext,uniphier-ld20-sd-clock
           - socionext,uniphier-pxs3-sd-clock
+          - socionext,uniphier-nx1-sd-clock
       - description: Peripheral clock
         enum:
           - socionext,uniphier-ld4-peri-clock
···
           - socionext,uniphier-ld11-peri-clock
           - socionext,uniphier-ld20-peri-clock
           - socionext,uniphier-pxs3-peri-clock
+          - socionext,uniphier-nx1-peri-clock
 
   "#clock-cells":
     const: 1