dt-bindings: timer: sifive,clint: 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 <geert@linux-m68k.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/62bf4ee6613550c07a99d4bd226ab0d33acae4c4.1643360652.git.geert@linux-m68k.org

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

@@ -57,10 +57,10 @@ examples:
   - |
     timer@2000000 {
       compatible = "sifive,fu540-c000-clint", "sifive,clint0";
-      interrupts-extended = <&cpu1intc 3 &cpu1intc 7
-                             &cpu2intc 3 &cpu2intc 7
-                             &cpu3intc 3 &cpu3intc 7
-                             &cpu4intc 3 &cpu4intc 7>;
+      interrupts-extended = <&cpu1intc 3>, <&cpu1intc 7>,
+                            <&cpu2intc 3>, <&cpu2intc 7>,
+                            <&cpu3intc 3>, <&cpu3intc 7>,
+                            <&cpu4intc 3>, <&cpu4intc 7>;
        reg = <0x2000000 0x10000>;
     };
 ...