Use Package Manager to disable stock OTA

This reverts commit ea14a88a2ac567104f267fda5a4507d0ae48040c.

Using the Package Manager prevents any danling wakelock from
killed service/receiver.

Change-Id: Ie3162ca4b18a7bc9c55613af39e88ea980407e5f
merge changes from CyanogenMod 10.2 into local branch