dt-bindings: timer: Add SpacemiT K1 CLINT

Add compatible string for SpacemiT K1 CLINT.

Signed-off-by: Yangyu Chen <cyy@cyyself.name>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Yixun Lan <dlan@gentoo.org>

Author: cyyself

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

@@ -31,6 +31,7 @@ properties:
           - enum:
               - canaan,k210-clint       # Canaan Kendryte K210
               - sifive,fu540-c000-clint # SiFive FU540
+              - spacemit,k1-clint       # SpacemiT K1
               - starfive,jh7100-clint   # StarFive JH7100
               - starfive,jh7110-clint   # StarFive JH7110
               - starfive,jh8100-clint   # StarFive JH8100