dt-bindings: arm: hisilicon: add binding for SD5203 SoC

Add devicetree binding for Hisilicon SD5203 SoC.
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Link: https://lore.kernel.org/r/20200929141454.2312-6-thunder.leizhen@huawei.comSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/arm/hisilicon/hisilicon.yaml

@@ -59,4 +59,9 @@ properties:
       - description: HiP07 D05 Board
         items:
           - const: hisilicon,hip07-d05
+
+      - description: SD5203 based boards
+        items:
+          - const: H836ASDJ
+          - const: hisilicon,sd5203
 ...