Revert "msm: bam_dmux: Use power efficient workqueues for"

This reverts commit 37f97599891bfee8b9441b027e755bf242e37afe.
Revert "workqueue: Add system wide power_efficient workqueues"

This reverts commit 4842b18ba6310296fd367aa5ee67c7542f659403.
Revert "workqueues: Introduce new flag WQ_POWER_EFFICIENT for power oriented workqueues"

This reverts commit d4c10032aa1c5d0e6375948cd2adaade8d388ad0.