ARM: dts: renesas: Group tuples in playback and capture properties

To improve human readability and enable automatic validation, the tuples
in "playback" and "capture" properties in sound device nodes should be
grouped using angle brackets.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20210204130517.1647073-3-geert+renesas@glider.be