dt-bindings: timer: add SpacemiT K3 CLINT

Add compatible string for SpacemiT K3 CLINT.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Guodong Xu <guodong@riscstar.com>
Link: https://lore.kernel.org/r/20260115-k3-basic-dt-v5-2-6990ac9f4308@riscstar.com
Signed-off-by: Yixun Lan <dlan@kernel.org>

Author: docularxu

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

@@ -33,6 +33,7 @@ properties:
               - eswin,eic7700-clint     # ESWIN EIC7700
               - sifive,fu540-c000-clint # SiFive FU540
               - spacemit,k1-clint       # SpacemiT K1
+              - spacemit,k3-clint       # SpacemiT K3
               - starfive,jh7100-clint   # StarFive JH7100
               - starfive,jh7110-clint   # StarFive JH7110
               - starfive,jh8100-clint   # StarFive JH8100