ASoC: wm_adsp: Cancel ongoing work when removing controls

Removes wm_adsp_ctl_work and integrates the work_struct into
wm_coeff_ctl so it may be referenced.

Signed-off-by: Simon Trimmer <simont@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20210913160057.103842-5-simont@opensource.cirrus.com


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