ASoC: bg: remove workqueue status check

Ensure to cancel the workqueue in proper state.
delayed_work_pending won't return proper state if
workqueue is currently executing.So remove workqueue
status check before cancelling the workqueue.

Change-Id: I6c1de0fdebb50920d4e8b030b231be0813c8c383
Signed-off-by: Bala Kishore Pati <balakishorepati@codeaurora.org>