sched: update ld_moved for active balance from the load balancer

ld_moved is currently left set to 0 when the load balancer calls upon
active balance. This behavior is incorrect as it prevents the termination
of load balance for parent sched domains. Currently the feature is used
quite frequently for power active balance and sched boost. This means that
while sched boost is in effect we could run into a scenario where a more
power efficient newly idle big CPU first triggers active migration from a
less power efficient busy big CPU. It then continues to load balance at the
cluster level causing active migration for a task running on a little CPU.
Consequently the more power efficient big CPU ends up with two tasks where
as the less power efficient big CPU may become idle. Fix this problem by
updating ld_moved when active migration has been requested.

Change-Id: I52e84eafb77249fd9378ebe531abe2d694178537
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>

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