Changeset 11648:3228be61f0ce

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cpu: Fix the O3 CPU Drain
The drain did not wait until stages were ready again. Therefore, as a

result of messages in the TimeBuffer being drain, the state after the

drain was not consistent and asserts fired in some places when the

draining happened after a stage got blocked, but before the notification

arrived to the previous stages.
Change-Id: Ib50b3b40b7f745b62c1eba2931dec76860824c71

Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>