ASoC: renesas: msiof: msiof_update_and_wait() checks whether reg was updated

msiof_update_and_wait() updates reg and waits until the value was updated.
But, if the set value was same as current reg value, no update will be
happen. Check the value, and ignore waiting if no update.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Message-ID: <87h5xsuqx2.wl-kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>