ASoC: cs35l56: Remove duplicate mbox log messages

cs35l56_mbox_send() logs a warning when sending a mbox command fails so
the callers can be simplified.

Signed-off-by: Simon Trimmer <simont@opensource.cirrus.com>
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20230420102043.1151830-1-rf@opensource.cirrus.com


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