dt-bindings: interrupt-controller: sifive,plic: Group interrupt tuples

To improve human readability and enable automatic validation, the tuples
in "interrupts-extended" properties should be grouped using angle
brackets.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Reviewed-by: Anup Patel <[e-mail]>
Signed-off-by: Marc Zyngier <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

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

···
       #interrupt-cells = <1>;
       compatible = "sifive,fu540-c000-plic", "sifive,plic-1.0.0";
       interrupt-controller;
-      interrupts-extended = <
-        &cpu0_intc 11
-        &cpu1_intc 11 &cpu1_intc 9
-        &cpu2_intc 11 &cpu2_intc 9
-        &cpu3_intc 11 &cpu3_intc 9
-        &cpu4_intc 11 &cpu4_intc 9>;
+      interrupts-extended = <&cpu0_intc 11>,
+                            <&cpu1_intc 11>, <&cpu1_intc 9>,
+                            <&cpu2_intc 11>, <&cpu2_intc 9>,
+                            <&cpu3_intc 11>, <&cpu3_intc 9>,
+                            <&cpu4_intc 11>, <&cpu4_intc 9>;
       reg = <0xc000000 0x4000000>;
       riscv,ndev = <10>;
     };