dt-bindings: arm: samsung: document g0s board binding

Add binding for the Samsung Galaxy S22+ (SM-S906B) board, codenamed G0S,
which is based on the Samsung Exynos2200 SoC.

Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20250504145907.1728721-2-ivo.ivanov.ivanov1@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Author: ivoszbg

Documentation/devicetree/bindings/arm/samsung/samsung-boards.yaml

@@ -45,6 +45,12 @@ properties:
           - const: samsung,aries
           - const: samsung,s5pv210
 
+      - description: Exynos2200 based boards
+        items:
+          - enum:
+              - samsung,g0s                     # Samsung Galaxy S22+ (SM-S906B)
+          - const: samsung,exynos2200
+
       - description: Exynos3250 based boards
         items:
           - enum: