dt-bindings: interrupt-controller: Add ESWIN EIC7700 PLIC

Add compatible string for ESWIN EIC7700 PLIC.

Signed-off-by: Darshan Prajapati <[e-mail]>
Reviewed-by: Samuel Holland <[e-mail]>
Signed-off-by: Pinkesh Vaghela <[e-mail]>
Acked-by: Conor Dooley <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnd Bergmann <[e-mail]>

Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml

···
       - items:
           - enum:
               - canaan,k210-plic
+              - eswin,eic7700-plic
               - sifive,fu540-c000-plic
               - spacemit,k1-plic
               - starfive,jh7100-plic