Revert "Revert "Revert "power: Front buffer early suspend draw delay sysfs control"""

This reverts commit 9a5fcf00144a297aff24625ecf65372cb0d71853.
Revert "sysfs-helpers: Allow negative values for array store"

This reverts commit cafcdeb8d218e4954c10b55c9f140debe25e7607.
Revert "Add a helper function for sysfs array stores"

This reverts commit 99f7f1993f9db4831ad0bd40495adf1bc3f8fe6d.