dt-bindings: clock: loongson2: Add Loongson-2K2000 compatible

Add the devicetree compatible for Loongson-2K2000 clocks.
Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/4820325406aec322ae7c062e2b03437d0c95e820.1712731524.git.zhoubinbin@loongson.cnAcked-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Documentation/devicetree/bindings/clock/loongson,ls2k-clk.yaml

@@ -18,6 +18,7 @@ properties:
     enum:
       - loongson,ls2k0500-clk
       - loongson,ls2k-clk  # This is for Loongson-2K1000
+      - loongson,ls2k2000-clk
 
   reg:
     maxItems: 1