ASoC: sof_es8336: fix possible use-after-free in sof_es8336_remove()

In the Linux kernel, the following vulnerability has been resolved:

ASoC: sof_es8336: fix possible use-after-free in sof_es8336_remove()

sof_es8336_remove() calls cancel_delayed_work(). However, that

function does not wait until the work function finishes. This

means that the callback function may still be running after

the driver's remove function has finished, which would result

in a use-after-free.

Fix by calling cancel_delayed_work_sync(), which ensures that

the work is properly cancelled, no longer running, and unable

to re-schedule itself.