dt-bindings: serial: renesas,scif: Make 'interrupt-names' property as required

As all the SoCs having multiple interrupts have 'interrupt-names' property
in their respective DTSIs, make 'interrupt-names' property as required
so that we can validate them using dtbs_check.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20240604170513.522631-4-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/serial/renesas,scif.yaml

@@ -180,6 +180,9 @@ allOf:
           maxItems: 1
 
         interrupt-names: false
+    else:
+      required:
+        - interrupt-names
 
   - if:
       properties: