Revert " timer: optimize apply_slack()"

This reverts commit 27c6cf774c14bb355cd613884cb4fed05d3780c4.
Revert "kernel: power: process: reduce the time until device enters lowpower mode"

This reverts commit 2396a959f77be7fc5a46ba400ad3028f50b03eb3.
Revert "omap: pm: move MPU PRCM interrupt event to perform before clearing source events"

This reverts commit 2e79ae76545c8a52f6755ddcd33c58a75b173f1e.
defconfig fixes