dt-bindings: arm: document R8A77980 SoC bindings

Document the R-Car V3H (R8A77980) SoC device tree bindings.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

Documentation/devicetree/bindings/arm/shmobile.txt

@@ -41,6 +41,8 @@ SoCs:
     compatible = "renesas,r8a7796"
   - R-Car V3M (R8A77970)
     compatible = "renesas,r8a77970"
+  - R-Car V3H (R8A77980)
+    compatible = "renesas,r8a77980"
   - R-Car D3 (R8A77995)
     compatible = "renesas,r8a77995"