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This patch clears the system cstate when offlining a CPU core as we
need to update the sytem cstate to SC7 only when we enter system
suspend.

Original change by Prashant Gaikwad <pgaikwad@nvidia.com>

Change-Id: I1cff9bbab4db7d390a491c8939aea5db6c6b5c59
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>