ASoC: cs35l56: Remove redundant 'flush_workqueue()' calls

'destroy_workqueue()' already drains the queue before destroying it, so
there is no need to flush it explicitly.

Remove the redundant 'flush_workqueue()' calls.

This was generated with coccinelle:

@@
expression E;
@@
-flush_workqueue(E);
 destroy_workqueue(E);

Signed-off-by: Chen Ni <nichen@iscas.ac.cn>
Link: https://patch.msgid.link/20250312072635.1429870-1-nichen@iscas.ac.cn


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