Revert "timer: Queue timers on least power cpu"

Revert commit e4b8535d ("timer: Queue timers on least power
cpu") which caused power regression with frequent wakeup by timer use
cases.

CRs-fixed: 936000
Change-Id: Ie958f78936d11e0d9cf448f4982b50a8f10d3d30
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>