dt-bindings: arm: amlogic: add SM1 bindings

Add bindings for the new Amlogic SM1 SoC Family.

It a derivative of the G12A SoC Family with :
- Cortex-A55 core instead of A53
- more power domains
- a neural network co-processor
- a CSI input and image processor
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

Documentation/devicetree/bindings/arm/amlogic.yaml

@@ -150,4 +150,7 @@ properties:
           - const: amlogic,s922x
           - const: amlogic,g12b
 
+      - description: Boards with the Amlogic Meson SM1 S905X3 SoC
+        items:
+          - const: amlogic,sm1
 ...