dt-bindings: timer: Add SOPHGO CV1812H clint

Add compatible string for the SOPHGO CV1812H clint.
Signed-off-by: Inochi Amaoto <inochiama@outlook.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Jisheng Zhang <jszhang@kernel.org>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>

Documentation/devicetree/bindings/timer/sifive,clint.yaml

@@ -38,6 +38,7 @@ properties:
           - enum:
               - allwinner,sun20i-d1-clint
               - sophgo,cv1800b-clint
+              - sophgo,cv1812h-clint
               - thead,th1520-clint
           - const: thead,c900-clint
       - items: