Revert "wakelock: use single threaded workqueueus"

This reverts commit 7cf296f8064db7991c4cffb13e07de1b5a981d4a.

Change-Id: Iff69627417b6607e9384019154c15b0ae0e8a20b
Merge branch 'cm-10.2' of https://github.com/CyanogenMod/android_kernel_samsung_smdk4412 into cm-10.2