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set_last_user_activity_timeout() is no longer used or useful.
It opens a sysfs node that no longer exists that used to
be published by a daemon that is no longer even compiled
and that is about to be deleted.  It used to be called
by the power manager with a huge value whose purpose was
essentially to disable the timeout feature altogether.

Long live dead code!

Bug: 6435382
Change-Id: If8f97a66f4e963a11e1c6b67ad97b41b2613043e