dt-bindings: dma: sifive,fu540-c000-pdma: Group interrupt tuples

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

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/20211125150233.161576-1-geert@linux-m68k.org


Signed-off-by: Rob Herring <robh@kernel.org>