dt-bindings: trivial-devices: Remove trailing whitespace

Remove trailing whitespace that hurts my eyes.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/7c1b2700f3727e94600f5f7e10beef16f8dc64ed.1673425053.git.geert+renesas@glider.be


Signed-off-by: Mark Brown <broonie@kernel.org>