ASoC: rsnd: tidyup brga/brgb default value

default value for brga/brgb should be 0xff instead of 0x2.
This patch tidyup it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87jztmzlew.wl-kuninori.morimoto.gx@renesas.com


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