dt-bindings: interrupt-controller: renesas,rzg2l-irqc: Update description for '#interrupt-cells' property

Update description for '#interrupt-cells' property to utilize the
RZG2L_{NMI,IRQX} for the first cell defined in the
include/dt-bindings/interrupt-controller/irqc-rzg2l.h file.

Signed-off-by: Lad Prabhakar <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Fixes: 96fed77 ("dt-bindings: interrupt-controller: Add Renesas RZ/G2L Interrupt Controller")
Signed-off-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: prabhakarlad

Documentation/devicetree/bindings/interrupt-controller/renesas,rzg2l-irqc.yaml

@@ -31,8 +31,9 @@ properties:
       - const: renesas,rzg2l-irqc
 
   '#interrupt-cells':
-    description: The first cell should contain external interrupt number (IRQ0-7) and the
-                 second cell is used to specify the flag.
+    description: The first cell should contain a macro RZG2L_{NMI,IRQX} included in the
+                 include/dt-bindings/interrupt-controller/irqc-rzg2l.h and the second
+                 cell is used to specify the flag.
     const: 2
 
   '#address-cells':