dev,arm: remove and recreate timer events around drains

Having timer events stored in checkpoints complicates Kvm
execution.  We change the timer behavior so that it always
deschedules any pending events on a drain() and recreates
them on a drainResume(), thus they will never appear in
checkpoints henceforth.  This pattern of behavior makes
it simpler to handle Kvm execution, where the hardware
performs the timer function directly.

Change-Id: Ia218868c69350d96e923c640634d492b5c19cd3f
Reviewed-on: https://gem5-review.googlesource.com/3541
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>

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