dt-bindings: interrupt-controller: add SpacemiT K3 APLIC

Add compatible string for SpacemiT K3 APLIC.

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-v5-3-6990ac9f4308@riscstar.com
Signed-off-by: Yixun Lan <dlan@kernel.org>

Author: docularxu

Documentation/devicetree/bindings/interrupt-controller/riscv,aplic.yaml

@@ -28,6 +28,7 @@ properties:
     items:
       - enum:
           - qemu,aplic
+          - spacemit,k3-aplic
       - const: riscv,aplic
 
   reg: