idle: Add a memory barrier after setting cpu_idle_force_poll
To ensure that CPUs see cpu_idle_force_poll flag
updates, add a memory barrier after writing to
the flag.
Change-Id: Ic3fdef7d17b673247bce5093530ce8aa08694632
Signed-off-by:
Vikram Mulukutla <markivx@codeaurora.org>
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