ASoC: dt-bindings: designware-i2s: add optional resets

Some SoC may have resets for I2S subsystem. So add optional resets support.

Signed-off-by: Maxim Kochetkov <fido_max@inbox.ru>
Link: https://lore.kernel.org/r/20230504071618.52012-2-fido_max@inbox.ru


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